シャドーイング練習: Every Sleep Disorder & Their Effects Explained - 動画で英語スピーキングを学ぶ

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Insomnia.

Lying awake at 3 a .m doing math you don't need feels like a personal failure.

It's not a character flaw.

It's your nervous system stuck in the wrong gear.

Here's what's actually happening.

Insomnia isn't just bad sleep.

It's your brain's arousal system staying switched on when it should be powering down,

often because stress hormones never got the memo that the day is over.

The messed up part is trying harder makes it worse.

The more you white -knuckle, I need to fall asleep right now, the more alert your brain becomes,

since anxiety itself is a wake -up signal your body takes seriously.

Chronic insomnia isn't cured by willpower.

It's cured by convincing your nervous system it's finally safe enough to stop guarding the door.

That's why sleeping pills often help temporarily but rarely fix the underlying pattern.

They sedate the guard without actually convincing it the threat has passed.

Cognitive behavioral therapy for insomnia consistently outperforms medication long -term,

precisely because it retrains the alarm system instead of just muting it for a few hours.

That approach takes weeks, not one dramatic night, which is exactly why it's so much less popular than a pill promising results by tonight.

Sleep apnea Snoring gets treated as an annoying quirk, something for a partner to complain about at breakfast.

Sometimes it's your airway physically collapsing dozens of times a night.

Here's the mechanism nobody explains.

In obstructive sleep apnea, throat tissue relaxes enough to block your airway completely, so your brain briefly wakes you just enough to gasp and reopen it,

often without you remembering any of it happening.

That can happen hundreds of times in a single night,

each one a tiny jolt of stress hormone and a robbed cycle of deep sleep you never get back.

You can sleep a full eight hours and still wake up exhausted, because technically you were interrupted all night long by your own throat.

Severe cases have been linked to serious cardiovascular strain over time, since your body treats each gasping wake -up as a small emergency,

repeated hundreds of times before sunrise.

A CPAP machine looks unglamorous on a nightstand, but for a lot of people it's the difference between waking up rested

and waking up feeling like they never actually slept at all.

Plenty of people resist wearing one out of vanity.

Then finally try it and describe feeling like a completely different, less exhausted human being within a single week.

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Restless legs.

An uncomfortable crawling urge to move your legs the second you finally lie down sounds made up.

It's a real, diagnosable neurological condition.

And it's brutal.

Here's the twist that makes it especially cruel.

Movement temporarily relieves the sensation,

so your body essentially bribes you into staying awake and pacing right when you're supposed to be shutting down for the night.

Researchers have linked it to dopamine signaling issues and low iron levels in the brain.

Which is why some cases improve dramatically with a simple blood test and supplement, not a sleeping pill.

The urge isn't in your head.

It's in a signaling pathway that picked the worst possible time to malfunction.

Caffeine, certain antihistamines, and even pregnancy can trigger or worsen episodes.

Which is exactly why so many people mistake it for restlessness instead of an actual medical condition.

Partners often describe it before the patient even notices the pattern themselves,

purely from watching someone quietly get up and pace the hallway at 1am for the third night running.

Night terrors.

Waking up screaming, heart pounding, with zero memory of it the next morning?

Sounds like a nightmare.

Technically, it's not one, and that's the unsettling part.

Here's what separates it from a bad dream.

Night terrors happen during deep non -dream sleep, which means the person isn't actually dreaming.

They're partially waking from the deepest sleep stage in a state of pure physiological panic, with no story attached.

That's why trying to comfort someone mid -episode often doesn't work.

They're not scared of a monster.

Their fight -or -flight system just misfired without ever consulting their conscious brain.

Kids usually outgrow it.

Adults who develop it later often get a much closer medical look.

The lack of memory afterward isn't denial or dishonesty either.

The brain genuinely never transitioned through the stage where that memory would have formed in the first place.

Parents often describe it as far scarier for them to witness than it apparently is for the child,

who typically wakes up the next morning with absolutely no idea their night was dramatic at all.

Sleepwalking.

Getting up walking around, sometimes holding a full conversation, all while completely asleep, sounds like a party trick.

It's actually your brain running two separate systems at once, badly.

Here's the mechanism.

Sleepwalking happens when the part of your brain controlling movement wakes up slightly

while the part responsible for consciousness and memory stays fully asleep, creating a walking, talking body with nobody currently home upstairs.

That's why sleepwalkers can navigate a familiar hallway perfectly, but have zero memory of it afterward.

The movement system clocked in.

Awareness stayed clocked out entirely.

Waking someone mid -episode isn't dangerous myth territory.

It's just often pointless, since there's genuinely nobody fully there yet to wake up.

The bigger risk is usually the environment itself.

Stairs, kitchens, front doors.

Not the person's intentions, since intentions genuinely aren't in the room at that moment.

Some cases have even ended up in courtrooms over actions taken while sleepwalking, which sounds absurd,

until you remember the legal system had to figure out what to do with a body acting entirely without its owner's awareness.

Delayed sleep phase.

Being wide awake at 2 a .m and useless before 10 a .m gets written off as bad discipline.

For some people, it's an actual shift in their internal biological clock.

Here's the mechanism behind it.

Delayed sleep phase disorder means someone's circadian rhythm runs several hours later than standard,

so their body genuinely doesn't produce sleep hormones until the rest of the world has already gone to bed.

Forcing an early bedtime doesn't fix this any more than forcing yourself to feel hungry at 6 a .m fixes appetite.

The clock inside is running on a legitimately different schedule.

It's not laziness dressed up as a diagnosis.

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It's a body clock that missed the memo everyone else received.

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Teenagers get hit with a milder version of this naturally, which is part of why forcing a 15 -year -old awake at 6 a .m.

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feels less like education and more like a small daily war crime.

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Light therapy and carefully timed melatonin can nudge the clock earlier over weeks, though the shift is slow,

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gradual, and nowhere near as simple as just deciding to go to bed earlier tonight.

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Shift work disorder.

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Working nights and sleeping days sounds like a simple schedule swap.

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Your biology disagrees violently with that plan.

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Here's the part employers rarely account for.

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Your internal clock is wired to daylight regardless of your work schedule,

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so night shift workers are essentially fighting their own hormones every single day just to stay awake or fall asleep on command.

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That mismatch has been linked to higher rates of heart disease, digestive issues, and impaired immune function.

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Not because night shifts are inherently evil, but because the body never fully adapts the way people assume it eventually will.

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You can train around it.

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You never fully beat biology that's been running the same program for a few hundred thousand years.

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Studies on rotating shift workers show measurable drops in alertness and reaction time that mirror mild sleep deprivation,

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permanently, for as long as the schedule continues.

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Nurses, pilots, and factory workers on rotating schedules are essentially living in a permanent state of manufactured jet lag,

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without ever actually getting to enjoy a vacation to explain it.

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Periodic limb movements.

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Twitching legs all night sound harmless, maybe even funny if a partner mentions it.

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The person doing the kicking usually has no idea it's happening at all.

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Here's what makes this one sneaky.

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Periodic limb movement disorder causes repetitive jerking, often every 20 to 40 seconds,

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that fragments deep sleep without ever fully waking the person experiencing it.

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They wake up exhausted with zero memory of a rough night, while their partner describes something closer to a nightly kickboxing match happening under the covers.

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Nobody clocks the damage, because nobody clocks the movements.

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The tiredness just shows up uninvited the next day with no explanation attached.

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It's sometimes only caught when a sleep study straps someone up for the night

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and the readout looks like a seismograph during a minor earthquake.

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It's also frequently linked with restless legs, which means some unlucky people get the daytime urge and the nighttime kicking as a genuinely unwanted matching set.

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Treating one condition sometimes noticeably improves the other, which is at least one small mercy buried inside an otherwise frustrating overlap.

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Central sleep apnea.

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This one sounds identical to regular sleep apnea from the outside, but the actual malfunction is happening somewhere completely different.

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Here's the distinction that matters.

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In central sleep apnea, the airway stays perfectly open.

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The problem is your brain simply forgets to send the signal to breathe at all, sometimes linked to heart failure or issues with the brainstem itself.

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That means the usual fixes for a blocked airway do nothing here, because nothing is physically blocked.

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The command center just goes quiet for a few unsettling seconds at a time.

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It's less a plumbing problem and more a wiring problem,

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which is exactly why it gets missed so often by anyone assuming all apnea looks the same.

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Treatment often has to target the underlying heart or neurological issue directly,

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since strapping on a standard airway device does nothing for a brain that simply forgot to send the order.

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Some newer devices actually monitor breathing patterns and deliver a tiny stimulus to remind the brain to breathe, essentially acting as a patient,

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mechanical nudge through the night.

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Narcolepsy.

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Falling asleep instantly, mid -conversation, mid -meal, sounds like a comedy sketch.

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For people with narcolepsy, it's an exhausting, occasionally dangerous daily reality.

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Here's the actual mechanism.

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Narcolepsy is frequently caused by the loss of brain cells producing a chemical called orexin,

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which normally keeps you stably awake so the boundary between sleep and wakefulness essentially breaks down entirely.

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Some people also experience cataplexy, sudden muscle weakness triggered by strong emotion like laughter,

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occasionally causing a full collapse mid -laugh with zero warning.

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It's not about being tired.

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It's a broken light switch between two states that everyone else takes completely for granted.

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Diagnosis is frequently delayed for years,

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since collapsing while laughing sounds so absurd that both patients and doctors initially assume something else entirely must be going on.

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Modern medications targeting the underlying chemistry have made a genuine difference,

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letting people laugh at a joke again without quietly bracing for their knees to give out.

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REM sleep behavior disorder.

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Normally, your body paralyzes itself during dreaming, a safety feature preventing you from acting out whatever nonsense your brain is currently generating.

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Sometimes that safety switch fails completely.

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Here's what happens when it does.

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People with REM sleep behavior disorder physically act out their dreams, punching, kicking, occasionally launching themselves out of bed entirely,

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all while still technically asleep and dreaming.

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Partners have been genuinely injured by someone mid -nightmare who had

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zero conscious control over what their body was doing at the time.

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Doctors take this one seriously too, since it's sometimes an early warning sign for neurological conditions that show up years later.

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That connection alone has turned a strange nighttime symptom into a genuinely useful early screening tool,

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sometimes catching a bigger problem a decade before it would have otherwise been noticed.

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A partner getting kicked or punched mid -dream isn't a sign of a bad relationship.

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It's a sign the body's own safety switch needs an actual medical look before things get worse.

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Exploding Head Syndrome Yes, it's a real diagnosis, and no, nothing is actually exploding.

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It's arguably the most dramatically named condition in all of sleep medicine.

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Here's what's really going on.

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Right as you're drifting off, some people experience a sudden imagined explosion of noise inside their own head, like a gunshot or a bomb going off,

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despite there being zero actual sound in the room.

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Researchers believe it's caused by neurons misfiring during the transition into sleep, essentially a glitch in the shutdown sequence that gets interpreted as a deafening bang.

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It's harmless, genuinely terrifying the first time, and proof that your brain's very last trick before sleep can sometimes be a truly unnecessary jump scare.

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Most people who experience it once assume they're having a stroke or a seizure,

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then feel understandably ridiculous explaining to a doctor that their head technically did not explode.

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Stress and sleep deprivation seem to make episodes more frequent, which means the cure occasionally boils down to something delightfully anticlimactic.

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Just sleep more and worry less.

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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「Every Sleep Disorder & Their Effects Explained」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, brain, sound。この動画には、シャドーイング用の文が182文、単語が2323語あります。音声の長さは14:44です。話す速さは1分あたり約158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74%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
clock 名詞	/klɑk/	走行距離計
asleep 形容詞	/əˈsliːp/	寝ている, 眠っている
awake 動詞	/əˈweɪk/	目覚める, 目を覚ます
disorder 名詞	/dɪsˈɔɹdɚ/	混乱
occasionally 副詞	/əˈkeɪʒənəli/	たまに, 偶に
mechanism 名詞	/ˈmɛk.ə.nɪ.zəm/	仕組み, 機構
technically 副詞	/ˈtɛk.nɪˌkəl.i/	厳密に
delay 名詞	/dɪˈleɪ̯/	遅れ, 遅延
cure 動詞	/kjɔː/	治す, 癒す
breathe 動詞	/bɹiːð/	呼吸する, 息をする
diagnosis 名詞	/daɪəɡˈnəʊsɪs/	診断
collapse 動詞	/kəˈlæps/	潰える, 崩壊する
urge 動詞	/ɜːd͡ʒ/	催促する, せきたてる
pill 名詞	/pɪl/	錠剤, 丸薬
hormone 名詞	/ˈhoɹmoʊn/	ホルモン

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
get up 動詞		起きる
show up 動詞		現れる
dress up 動詞		着飾る
lie down 動詞		横になる, 臥す

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
現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している	has passed · have been linked · have linked
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	isn't cured · were interrupted · have been linked
関係詞節 who / which + 節 — 人や物について情報を加える	night, which is · sleep, which means · legs, which means

注意したい発音

話し手はisn't, doesn't, they'reなど、短縮形や弱形を18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/, throat /ˈθɹoʊt/, earthquake /ˈɝθkweɪk/, mathematics /mæθ(.ə)ˈmæt.ɪks/, myth /mɪθ/
「sh」と「zh」の音: essentially /ɪˈsɛnʃəli/, occasionally /əˈkeɪʒənəli/, conscious /ˈkɑn.ʃəs/, intentions /ɪnˈtɛnʃənz/, transition /tɹænˈzɪʃ.ən/
長い単語（アクセントの位置に注意）: genuinely /ˈd͡ʒɛn.ju.ɪn.li/, essentially /ɪˈsɛnʃəli/, occasionally /əˈkeɪʒənəli/, mechanism /ˈmɛk.ə.nɪ.zəm/, technically /ˈtɛk.nɪˌkəl.i/

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: rarely /ˈɹɛəɹli/, temporarily /ˌtɛmpəˈɹɛɹəli/, harmless /ˈhɑɹmləs/, restless /ˈɹɛstlɪs/, naturally /ˈnæt͡ʃ.(ə.)ɹə.li/
/v/ — /b/ にならないように、上の歯を下唇に当てる: convince /kənˈvɪns/, vacation /veɪˈkeɪ.ʃən/, cognitive /ˈkɑɡ.nɪ.tɪv/, deprivation /ˌdɛp.ɹɪˈveɪʃən/
/f/ — 「フ」ではなく、上の歯と下唇で出す: physically /ˈfɪz.ɪ.kli/, afterwards /ˈæf.tɚ.wɚdz/, carefully /ˈkɛɹf(ə)li/, comfort /ˈkʌm.fət/, frequent /ˈfɹiː.kwənt/

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。clock, asleep, awake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: Every Sleep Disorder & Their Effects Explained - 動画で英語スピーキングを学ぶ

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