シャドーイング練習: Everyday Habits Quietly Killing You - 動画で英語スピーキングを学ぶ

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Sitting all day.

You didn't choose this.

Your job did, your commute did, your couch did, and your body is quietly furious about it.

Here's the thing nobody tells you.

The moment you sit down, the largest muscles in your body basically switch off.

Blood flow slows.

The enzyme responsible for breaking down fat in your bloodstream drops by something like 90 % within an hour.

That's not a typo.

90%.

One hour of sitting and your body essentially stops processing fat the way it's supposed to.

The messed up part is you can't out -exercise it.

An hour at the gym doesn't undo eight hours in a chair.

Researchers call it active couch potato syndrome, which is a nice way of saying your gym membership is not saving you.

Your body was built to move constantly in short bursts.

Instead, it spends most of its day being held in a chair, wondering what happened.

Standing desks alone don't fully fix this either, which annoys everyone who bought one expecting a miracle.

Static standing barely moves the needle compared to walking.

Your muscles need actual movement, not just a different angle to be motionless in.

Every long stretch of sitting is basically your body being put on pause.

It doesn't clock out for lunch, it just quietly waits for you to remember it exists.

Phone in bed, blue light spiral.

You tell yourself it's just five more minutes.

It's never five more minutes.

Here's what's actually happening.

That screen inches from your face is pumping out blue wavelength light directly into your eyes, and your brain interprets that as daylight.

Your pineal gland delays releasing melatonin, sometimes by over an hour.

So you're not just tired and scrolling.

You're actively telling your own body it's still afternoon while lying in the dark at midnight.

The trap gets worse from there.

The content itself is designed to never let you land on a stopping point.

No chapter ends, no credits roll.

It just keeps generating the next thing, and your thumb keeps obeying.

You wake up groggy and blame the alarm.

The alarm didn't do this to you.

The 300 videos you watched at 1am did.

Here's the part that makes it worse.

Even if you fall asleep fine, the quality of that sleep takes a hit.

Suppressed melatonin doesn't just delay when you fall asleep, it also shortens the deep sleep phases where your brain actually does its cleanup work.

So you can technically clock eight hours and still wake up feeling like you got four.

Your phone didn't steal your bedtime.

It quietly hollowed out the sleep you thought you were getting.

I'll catch up on sleep later.

Here's the belief killing more people than most diseases combined.

Sleep debt doesn't work like a bank account.

You cannot simply pay it back on Saturday.

Studies on this are genuinely brutal.

One bad night measurably impairs your immune function the next day.

String together a week of short sleep and your reaction time drops to somewhere around the level of being legally drunk.

You'd never drive after four beers.

You'll absolutely drive after four hours of sleep.

Sleeping in on the weekend helps a little, sure, but it doesn't reverse the cellular damage that accumulated during the week.

Your brain was supposed to clear out waste proteins overnight, every night.

Skip that enough times and those proteins just keep piling up.

That's the actual mechanism behind a chunk of dementia research right now, not one dramatic night.

Years of I'll catch up later that never actually caught up to anything.

Weekend sleep -ins do provide some relief, briefly, but researchers have found the metabolic effects of a short week of sleep, things like impaired insulin sensitivity,

don't fully bounce back with just two extra long nights.

The debt gets partially forgiven, never fully erased.

You wouldn't skip meals all week and call one huge Sunday dinner catching up on food.

Sleep doesn't work any differently, and your body's been sending the invoice for years.

Ultra -processed default eating.

Here's the trick food companies figured out decades ago.

Combine sugar, fat, and salt in a ratio your brain has literally never encountered in nature,

and your reward system lights up harder than it does for the individual ingredients alone.

It's called the bliss point, and it's not an accident.

The result is food that doesn't just taste good, it actively overrides your fullness signals.

Studies comparing ultra -processed diets to whole food diets,

with identical calories found people eating the processed version simply ate more without noticing.

Nobody sits down and decides to eat 2 ,000 extra calories a week.

It happens one convenient, engineered bite at a time, and the packaging never once mentions that part.

The marketing does the opposite job on purpose.

Words like natural, protein -packed, or made with real fruit sit right next to an ingredient list,

20 items long, that a food scientist wrote not a farmer.

You're not weak for reaching for the easy option at 9 p .m.

You're responding exactly the way a product built in a lab

tested on thousands of brains just like yours was designed to make you respond.

Chronic stress as normal.

If you're not stressed, are you even doing anything?

That's the joke everyone tells while their body quietly falls apart.

Here's the mechanism.

Your stress response was built for short emergencies.

Spike cortisol, escape the threat, cortisol drops back down.

Modern life doesn't do the second part.

The threat is your inbox, and your inbox never actually resolves.

So cortisol just stays elevated day after day.

Chronically high cortisol suppresses your immune system, breaks down muscle tissue, and has been directly linked to visceral fat storage specifically around your organs.

The messed up part is stress has become a personality trait people are proud of.

I thrive under pressure is often just

My adrenal system hasn't fully collapsed yet Give it time

Here's what nobody puts on a motivational poster

Chronic elevated cortisol also disrupts the exact hormones

Responsible for regulating hunger

Which is part of why stressed people crave sugar and carbs specifically

Not celery So the burnout, the weight gain, and the constant craving for something sweet at 3pm Aren't three separate problems

They're one system quietly screaming the same message in three different accents.

Dehydration you don't feel.

By the time you feel thirsty, you're already behind.

Thirst isn't an early warning system.

It's a late one.

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Here's what a couple percent of dehydration actually does.

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Cognitive performance drops.

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Mood gets worse.

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Headaches show up for no obvious reason

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and most people never connect them back to the three coffees and zero glasses of water they've had all day.

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Your brain is roughly 75 % water, and it's extremely sensitive to even mild fluid loss.

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Studies show measurable drops in concentration and short -term memory at dehydration levels most people wouldn't even notice physically.

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So that afternoon brain fog you've decided is just how you are might actually just be your brain running on fumes.

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Nobody diagnosed this, you just quietly assumed it was your personality.

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Caffeine makes it sneakier too.

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Caffeine is a mild diuretic, so

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that morning coffee you're relying on to feel human is quietly

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pulling water out of you at the exact same time it's waking you up.

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You spend the whole day chasing alertness with the one drink

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that's low -key working against the water your brain actually needed in the first place.

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Mouth breathing weak airway.

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You've probably never once thought about how you breathe.

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That's exactly the problem.

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Here's what nose breathing does that mouth breathing skips entirely.

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Your nose filters air, humidifies it, and adds nitric oxide that helps your lungs absorb oxygen more efficiently.

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Your mouth does none of that.

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It just lets air straight in, unfiltered, and dry.

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Chronic mouth breathing, especially at night, is linked to worse sleep quality.

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Dry mouth that increases cavities, and in kids, it can actually affect facial and jaw development over time.

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Here's the part that should annoy you.

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Most people don't even know they do it.

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You fall asleep with your mouth closed and wake up with a mouth like sandpaper, and you never once ask why.

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Your airway has been quietly working overtime all night, and nobody sent you the memo.

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It also quietly messes with your sleep architecture.

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Mouth breathing is strongly linked to snoring and mild sleep apnea, which means you can sleep a full eight hours and still wake up exhausted,

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because your brain kept getting nudged awake to reopen an airway that was never fully clear.

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You blame the mattress, you blame the room temperature, meanwhile the actual problem has been sitting in the middle of your face the entire time.

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Skipping strength, muscle, and bone loss.

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After 30, you start losing muscle mass every single year whether you notice or not.

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Nobody warns you about this at 29.

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Here's the actual number.

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Without resistance training, adults can lose somewhere around 3 -8 % of their muscle mass per decade after 30,

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and that rate speeds up as you get older.

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Bone density follows a similar quiet decline.

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The trap is that this loss is invisible for years.

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You still fit in your clothes.

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You still walk around fine.

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Then, one day, lifting a suitcase into an overhead bin feels harder than it used to, and you write it off as just getting older.

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It's not just getting older.

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It's a decade of never once asking your muscles to do anything difficult, and your body simply stopped investing resources in things you weren't using.

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Bone follows the exact same rule, just slower and quieter.

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Bone is living tissue that responds to load.

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No load, no reason for your body to keep reinforcing it.

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That's how someone can trip on a curb at 60

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and end up with a fracture that would have been a bruise at 30.

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Nobody feels their bone density dropping.

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You just find out the hard way, usually at the worst possible moment, on the worst possible surface.

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Loneliness as routine.

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You can be surrounded by people all day and still be completely alone.

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Your body cannot tell the difference, and it reacts accordingly.

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Here's the part researchers keep finding.

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Chronic loneliness has been linked to inflammation markers similar to those seen in people under constant physical stress.

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One widely cited comparison put the health risk of prolonged loneliness on par with smoking roughly 15 cigarettes a day.

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That sounds dramatic until you realize why.

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Humans evolved in tight social groups where isolation meant real danger.

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Your nervous system still treats being cut off from people as a threat, even when the threat is just a full inbox and zero actual conversations.

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You can text 40 people a day and still feel completely unseen.

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Texting isn't connection.

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It just looks enough like it to fool you for a while.

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The cruelest part is loneliness makes people worse at reading social cues, which makes reconnecting even harder.

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Isolated brains get more defensive, more likely to interpret a neutral text as a cold one,

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which pushes people further away right when they need to move closer.

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It's a spiral that convinces you everyone else pulled back first when really, your own wiring just started working against you.

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Social binge drinking.

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It's just a few drinks with friends.

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Nobody calls it what it technically is.

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Here's the definition that might surprise you.

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Binge drinking is usually defined as four or more drinks for women, five or more for men, within about two hours.

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Most people hit that on a completely normal Friday night without thinking twice.

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The damage isn't just the hangover.

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Even one binge episode temporarily increases inflammation and impairs the lining of your blood vessels for up to 24 hours afterward.

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Do that weekly for years, and you're not having a few casual drinks.

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You're running a low -grade assault on your cardiovascular system every single week.

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Nobody frames it that way at the bar.

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It's just Friday.

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Your liver has a very different opinion on the matter.

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Here's the part that quietly compounds over years.

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It's not just the liver either.

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Regular binge episodes are associated with higher blood pressure over time and have been linked to irregular heart rhythms,

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sometimes nicknamed holiday heart, because it shows up so often right after a big weekend of drinking.

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The hangover ends by Sunday afternoon.

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The cardiovascular wear doesn't get a day off, and it's been quietly compounding since long before you noticed the first gray hair.

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Ignoring small chest or breath weirdness.

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It's probably nothing, right?

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That sentence has ended more lives than it should have.

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Here's the uncomfortable truth about heart attack symptoms.

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They're often not the dramatic clutch -your -chest moment from movies.

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Sometimes it's mild pressure, unusual fatigue, a bit of breathlessness climbing stairs you normally handle fine.

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Easy to explain away is stress, or getting older, or just a bad night's sleep.

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Studies on delayed treatment consistently show the same pattern.

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People wait, hoping it passes, and every hour of delay measurably worsens outcomes when it actually is something serious.

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You're not being dramatic by getting it checked.

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You're being dramatic by deciding you're a doctor based on a five -second vibe check

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and a Google search you didn't even finish reading.

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Here's the thing that makes this genuinely tricky.

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A lot of these symptoms overlap almost exactly with anxiety, which means people talk themselves out of checking twice as often.

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It's probably just stress has become the single most dangerous sentence in modern healthcare, purely because it's usually true, right up until it isn't.

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Getting it checked and being told it's nothing costs you an afternoon.

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Not getting it checked and being wrong costs you considerably more than that.

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I'll sleep when I'm dead.

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Here's the thing about that phrase.

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It's usually said by someone actively speeding up that timeline.

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Sleep deprivation doesn't just make you tired.

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It's been linked to increased risk of heart disease, impaired glucose metabolism that mimics prediabetes,

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and measurable cognitive decline that looks a lot like early aging when you scan the brain.

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Hustle culture rebranded exhaustion as dedication, and somehow everyone agreed to play along.

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The founders, who bragged about four hours of sleep in 18 -hour days, weren't secretly superhuman.

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They were running on borrowed time, and the bill eventually arrives whether you're ready for it or not.

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Nobody's ever looked back on their life wishing they'd slept less.

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They just wish somebody had told them the sentence was a warning, not a flex.

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The irony is sleep deprivation doesn't even deliver the productivity it promises.

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Cognitive testing shows people running on five hours a night for

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two weeks perform as poorly as someone who's been awake for 24 hours straight while insisting they feel completely fine.

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That's the part that should genuinely worry you.

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You're not just tired, you've lost the ability to accurately judge how impaired you actually are, and you called it hustle the whole time.

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このレッスンの語彙とスピーキングのポイント

このスピーキングレッスンは、動画「Everyday Habits Quietly Killing You」を教材にしています。繰り返し出てくる語は次のとおりです：sleep, hour, brain, quietly。この動画には、シャドーイング用の文が218文、単語が2499語あります。音声の長さは15:04です。話す速さは1分あたり約166語で、日常会話に近い自然なペースです。英語の頻出3,000語に含まれる単語は78%だけなので、語彙は難しめです。

この動画の重要語彙

動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。

単語	発音	意味
quietly 副詞	/ˈkwaɪ.ɪt.li/	静かに
muscle 名詞	/ˈmʌs.əl/	筋肉, 筋
breathe 動詞	/bɹiːð/	呼吸する, 息をする
bone 名詞	/boʊn/	骨
dramatic 形容詞	/dɹəˈmætɪk/	劇的, ドラマティック
delay 名詞	/dɪˈleɪ̯/	遅れ, 遅延
chronic 形容詞	/ˈkɹɑ.nɪk/	慢性的
mild 形容詞	/ˈmaɪld/	穏やか, 緩やか
loneliness 名詞	/ˈloʊnlinəs/	孤独, 寂しさ
asleep 形容詞	/əˈsliːp/	寝ている, 眠っている
researcher 名詞	/ˈɹiˌsɝ.t͡ʃɚ/	研究員, 研究者
inbox 名詞	/ˈɪnbɑks/	受信箱
clock 名詞	/klɑk/	走行距離計
density 名詞	/ˈdɛn.sə.ti/	密度, 濃度
trap 名詞	/tɹæp/	罠

動画に出てくる句動詞

単語	発音	意味
wake up 動詞	/ˌweɪk ˈʌp/	目覚める, 目を覚ます
sit down 動詞		座る, 腰掛ける
speed up 動詞	/spiːdˈʌp/	スピードを出す
find out 動詞		見出す, 調べる
show up 動詞		現れる
switch off 動詞		消す, 切る

繰り返し練習したい文

動画に出てくる短く完結した文です。日常会話でそのまま使えます。

Here's the thing nobody tells you.
You tell yourself it's just five more minutes.
The alarm didn't do this to you.
Your phone didn't steal your bedtime.
If you're not stressed, are you even doing anything?

この動画の文法

話し手がよく使っている文型を、動画の実際の表現とともに紹介します。

文型	動画での表現
現在完了進行形 have/has been + -ing — 以前に始まり今も続いている動作	body's been sending · has been sitting
現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している	have found · has literally never encountered · has been
受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる	was built · being held · being put
関係詞節 who / which + 節 — 人や物について情報を加える	syndrome, which is · everyone who bought · apnea, which means

注意したい発音

話し手はyou're, doesn't, didn'tなど、短縮形や弱形を57回使っています。聞こえたとおりの短い形で発音しましょう。

「th」の音: breathe /bɹiːð/, thumb /ˈθʌm/
「sh」と「zh」の音: tissue /ˈtɪʃ.(j)u/, inflammation /ɪnfləˈmeɪ̯ʃən/, unusual /ʌnˈjuːʒ(u)əl/, essentially /ɪˈsɛnʃəli/, ratio /ˈɹeɪ.ʃoʊ/
長い単語（アクセントの位置に注意）: genuinely /ˈd͡ʒɛn.ju.ɪn.li/, mechanism /ˈmɛk.ə.nɪ.zəm/, technically /ˈtɛk.nɪˌkəl.i/, inflammation /ɪnfləˈmeɪ̯ʃən/, cardiovascular /ˌkɑːdi.əʊˈvæskjʊlə(ɹ)/

日本語話者が苦手な音：

/r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: roughly /ˈɹʌf.li/, alarm /əˈlɑɹm/, ultra /ˈʌltɹə/, spiral /ˈspaɪɹəl/, cardiovascular /ˌkɑːdi.əʊˈvæskjʊlə(ɹ)/
/v/ — /b/ にならないように、上の歯を下唇に当てる: actively /ˈæktɪvli/, cognitive /ˈkɑɡ.nɪ.tɪv/, cardiovascular /ˌkɑːdi.əʊˈvæskjʊlə(ɹ)/, hangover /ˈhæŋoʊ̯vɚ/ ~ /ˈhæŋɔʊ̯vɚ/, sensitive /ˈsɛn.sɪt.ɪv/
/f/ — 「フ」ではなく、上の歯と下唇で出す: roughly /ˈɹʌf.li/, inflammation /ɪnfləˈmeɪ̯ʃən/, caffeine /ˈkæfiːn/, belief /bɪˈliːf/, defensive /dɪˈfɛn.sɪv/

この動画での練習方法

まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
自分の声を録音して元の音声と比べます。quietly, muscle, breatheなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →

シャドーイング練習: Everyday Habits Quietly Killing You - 動画で英語スピーキングを学ぶ

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