シャドーイング練習: The REAL Reason Diabetes Is So Dangerous - 動画で英語スピーキングを学ぶ

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Right this very second, sugar is circulating throughout the blood vessels in your body.

And that sugar is supposed to be fueling your cells.

But the balance of sugar in your blood

and the amount of sugar going into your cells is actually a very tightly regulated metabolic process.

But unfortunately, even in the year 2026, with all the technology and medical knowledge that we've accumulated,

we still have more people with metabolic dysfunction than we've ever had before.

And the main disease of metabolic dysfunction is diabetes.

It's estimated that over 530 million adults have diabetes, and those numbers are even increasing in kids.

And you might think, well, we just have more people on planet Earth.

But even when we adjust for population, the percentage of people with diabetes has still increased dramatically, roughly doubling since the 1990s.

And that's not just because human genetics have suddenly changed over the last 30 years, it's largely due to lifestyle changes.

But if it's largely due to lifestyle changes, that means we can actually do something about it, especially with type 2 diabetes.

So today, with the help of the bodies in the lab, we're going to walk through what diabetes actually is, type 1 and type 2,

what causes it, what the long-term health consequences are if it's not treated, and whether or not you can actually cure it.

It's going to be a sugary one.

So let's jump into this anatomical and physiological awesomeness.

So, before we take a look at a very important organ that has to do with diabetes, we first need to cover a key idea.

Your body is constantly trying to control the amount of sugar in your blood, what we often refer to as blood sugar or blood glucose levels.

So if I use blood sugar or blood glucose interchangeably throughout the video, just know that I'm talking about the same thing.

Glucose is one of your body's primary fuel sources.

Every time you eat carbohydrates, they're broken down and absorbed into your bloodstream, then causes your blood glucose levels to rise.

But if that glucose just stayed in your bloodstream, it wouldn't be very useful.

It actually needs to get to the inside of your cells.

And that's where a very important hormone comes into play and that is insulin.

And if we're going to talk about insulin, we definitely need to take a look at a real human pancreas.

So just to orient you, you're looking at the inside of the abdominal cavity.

So about right in this region.

And here Here you can see the liver, here's the stomach, and if I reflect the stomach, you can see the pancreas.

Anatomically, the pancreas can be divided into the head, the body, and even the tail that you can see me lifting up right there.

And what makes the pancreas so interesting is that it's both an exocrine gland and an endocrine gland.

The exocrine portion of the pancreas produces digestive enzymes and secretes those enzymes

into the small intestine that you can see wrapping around right here.

But the endocrine portion is what we care about today.

Within this tissue are specialized cells called beta cells that produce insulin.

And to understand exactly what stimulates the release of insulin from the pancreas and what insulin does once it enters the bloodstream,

we're going to have to move over to our wonderful little diagram on the whiteboard.

So here we have a picture of the pancreas and the first part of the small intestine.

And full disclosure, I trace these.

I'm certainly not a great artist as you can tell by my drawing of the cell.

When I'm left to draw things on my own, we end up with cells looking like smiley faces.

But you can totally tell that the outside is representing the cell membrane with some insulin receptors embedded here.

We also have a blood vessel represented here.

But when you eat carbohydrates, those carbs will get broken down and eventually be absorbed into the bloodstream as glucose, which will raise your blood glucose or blood sugar levels.

And the glucose is represented as these black dots in the blood vessel.

In response, the pancreas releases insulin, which are represented, the insulin molecules are represented by these blue triangles.

The insulin will travel through the blood and will bind to the receptors on the surface of the cells.

When insulin binds to those receptors, it essentially tells the cells to do this.

eat the sugar.

And the cell responds by taking in the glucose from the bloodstream.

And so insulin lowers blood sugar levels by helping glucose move from the blood

and into the cell where it can actually be utilized for energy.

When this system works, your blood sugar stays tightly regulated.

But when it doesn't, that's when we start running to issues such as diabetes.

Diabetes is typically classified into two main types, type 1 diabetes and type 2 diabetes.

Now the simplest distinction between the two is that with type 1 diabetes, you essentially don't have insulin.

And with type 2 diabetes, you do have insulin, but it isn't working properly.

But let's go into a little bit more detail.

In type 1 diabetes, the immune system attacks and destroys the beta cells in the pancreas.

And so technically type 1 diabetes is an autoimmune disease

and this results in the pancreas losing its ability to produce insulin

but no insulin means no signal telling the cell to take in the glucose so now we're going to have a

sad cell unfortunately here with no glucose or sugar going inside

and so what the result is is that glucose will stay in the bloodstream

and this will therefore raise blood sugar levels

Type 1 diabetes accounts for about 5 to 10% of cases and typically develops earlier in life.

And this isn't really something that you can prevent.

It is largely genetics combined with what we might simply call bad luck.

With type 2 diabetes, the pancreas is still actually producing insulin, but the cells become resistant to its effects.

Maybe you've heard people use the phrase insulin resistance, and this is what they're referring to.

Insulin is still there, but the cells don't respond to it as well.

And so you kind of might get something like this.

Insulin will still bind to the receptor, but the cell or this resistant cell might respond to insulin by saying something like this.

And that's obviously not very nice of the cell.

And so as a result, glucose remains in the bloodstream and blood sugar levels rise.

Now, before we move on, I want to briefly talk to you about GLP-1 medications in

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There are real physiological processes at play.

Now, GLP-1 medications work by mimicking hormones involved in appetite regulation and blood sugar control, which can help some individuals reduce caloric intake and improve their metabolic health.

But I want to be very clear here.

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There are also people who genuinely struggle with this over long periods of time.

And when you start weighing the potential benefits of a medication like this against the long-term risks of excess adipose tissue, some of which we're talking about in this video,

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And now, let's get back to the video.

So with both type 1 and type 2 diabetes, you do get a similar end result, and that is the elevation of blood sugar levels

but through different causes and mechanisms and what's interesting about type 2 diabetes is

that early on the pancreas actually tries to compensate by producing more insulin

and almost like the pancreas is trying to yell at the cells

or give them a stronger signal to take in the glucose

and early on this actually does work to a degree so

that in the very early stages of developing type 2 diabetes someone's blood glucose levels

and a1c might still be normal so if a medical provider is still suspicious

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that a patient may be at risk for type 2 diabetes

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despite initial normal blood glucose levels they may consider additional testing like glucose tolerance testing

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and in some cases even looking at insulin levels to confirm

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that suspicion but over time this compensation of the pancreas producing extra insulin can't keep up

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and eventually the person's blood glucose begins to rise into pre-diabetic ranges and even eventually into full-blown diabetic ranges.

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And if someone with type 2 diabetes doesn't intervene with treatment, there are cases where the pancreas can start to wear out,

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meaning those insulin-producing cells begin to lose their function and start producing less insulin over time,

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eventually to the point where someone with type 2 diabetes may need to start taking insulin.

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So why is high blood sugar such a problem?

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Well, glucose itself isn't bad, but when it remains elevated in the bloodstream for too long, it begins to damage tissues, especially blood vessels.

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And this is where we start to see the real consequences of diabetes.

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Chronic high blood sugar can damage the inside lining of the blood vessels that supply critical tissues throughout the body.

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So damage to the blood vessels in the eye can lead to vision loss.

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Damage to the blood vessels in the kidneys can lead to kidney failure.

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And it's not just a blood vessel problem.

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Elevated glucose can also directly damage cells themselves, including nerve cells.

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And when it comes to nerves, it actually is a combination of both.

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Damage to the blood vessels that supply the nerves along with direct damage to the nerves themselves, which can lead to numbness, tingling, or loss of sensation.

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And this is called diabetic neuropathy.

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And over time, it can also cause damage to large blood vessels, increasing the risk of heart disease and stroke.

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But what actually causes the insulin resistance that leads to type 2 diabetes in the first place?

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Well there are some factors we can't control such as genetics

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and family history can increase your risk by two to three times.

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But there are also factors we can control.

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One of the biggest is the amount of fat or adipose tissue.

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As adipose tissue increases it releases signaling molecules called adipokines along with other inflammatory signals

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which can interfere with how cells respond to insulin making them more resistant.

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This is why increased body fat is strongly associated with type 2 diabetes,

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especially visceral fat which is the fat found inside your body cavities surrounding your organs.

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This type of fat tends to be more metabolically active than the subcutaneous fat found just beneath the skin

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and is one of the main reasons why visceral fat is more strongly associated with insulin resistance.

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The encouraging part is that reducing adipose tissue often improves insulin sensitivity.

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And so that often leads people to wonder, if I lose fat, especially visceral fat, can that help me prevent developing type 2 diabetes?

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And the answer is yes.

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Typically as fat levels go down, insulin sensitivity improves.

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And the primary ways we reduce fat are through exercise and diet, ideally a combination of both.

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Now there are some people out there who claim certain forms of exercise can specifically target

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or burn visceral fat more than the subcutaneous fat.

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But this is where we need to be a little careful.

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You can't perform a specific exercise like doing ab workouts or certain forms of cardio and directly target visceral fat only.

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That's not how fat loss works.

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When your body loses fat, it pulls from both visceral and subcutaneous fat.

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But here's where the nuance comes in.

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Visceral fat is more metabolically active

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which means it tends to respond more readily to things like a caloric deficit and regular exercise.

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So when people start exercising consistently and losing weight, they often do see reductions in visceral fat, sometimes even relatively quickly compared to subcutaneous fat.

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And that's likely contributed to where this idea of targeting visceral fat comes from.

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It's not that a specific exercise is only targeting visceral fat, it's that visceral fat is simply more responsive to the overall process of fat loss.

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Now obviously diet plays a huge role here but there is no single perfect diet.

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In general, prioritizing whole foods, managing total caloric intake, and maintaining a healthy body composition are going to be the biggest factors in reducing risk.

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And one other thing with exercise.

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Exercise doesn't just burn calories, it directly improves how your body handles glucose.

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When muscles contract during exercise, they can take in glucose without needing insulin, which is quite remarkable.

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After exercise, those same muscle cells become more sensitive to insulin and over time, consistent exercise leads to more mitochondria,

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more metabolic enzymes, and better overall glucose metabolism.

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And so in many ways, exercise directly targets the core problem in type 2 diabetes.

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Now preventing diabetes is one thing, but what if someone already has diabetes?

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How do you treat it and can you cure it?

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Well, for type 1 diabetes, the main treatment is insulin replacement because the body cannot produce it.

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And as of right now, we don't have a reliable way to restore that lost insulin producing capacity after the autoimmune destruction of those beta cells.

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So individuals with type 1 diabetes require insulin to survive.

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For type 2 diabetes, one of the main approaches to treatment is actually the same as prevention, and that is lifestyle changes such as diet and exercise.

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But this is often combined with medications, with metformin being one of the most commonly used first line treatments.

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But if blood glucose levels still aren't well controlled, additional medications may need to be added, such as GLP-1 receptor agonists,

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SGLT2 inhibitors, or in some cases even insulin.

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But again, here's the promising part.

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In some cases, individuals with type 2 diabetes can improve their condition so much through lifestyle modifications, diet, exercise, and weight loss,

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that their blood sugar levels can return to normal and they no longer need medication.

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And in a way, you might be tempted to think of this as a cure.

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But the medical community is careful about their wording and typically doesn't use the word cure in this instance.

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Instead this is referred to as remission because if those lifestyle factors change or if the underlying metabolic dysfunction returns, the diabetes can come back.

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But again, it is very cool

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that we have quite a bit of control over this

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and can reduce the long term consequences that unmanaged diabetes can lead to.

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the issues we discussed with the eyes, kidneys, nerves, and cardiovascular system.

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So hopefully you learned some useful information from today's video.

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Thank you so much for watching and supporting our channel.

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Of course, we'll see you in the next video.

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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C1レベルのスピーキングレッスンは、動画「The REAL Reason Diabetes Is So Dangerous」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：insulin, diabetes, blood, type, cell。この動画には、シャドーイング用の文が177文、単語が2633語あります。音声の長さは15:22です。話す速さは1分あたり約171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81%だけなので、語彙は難しめです。

この動画の重要語彙

動画の中で特に難しい単語15語を、発音と意味つきで紹介します。

単語	発音	意味
insulin 名詞	/ˈɪnsəlɪn/	インスリン, インシュリン
glucose 名詞	/ˈɡluː.kəʊz/	ブドウ糖, 葡萄糖
pancreas 名詞	/ˈpæŋ.kɹi.əs/	膵臓
bloodstream 名詞	/ˈblʌd.stɹɪim/	血液, 血流
subcutaneous 形容詞	/sʌbkjuːˈteɪnɪəs/	皮下の
dysfunction 名詞	/dɪsˈfʌŋk.ʃən/	機能不全
enzyme 名詞	/ˈɛn.zaɪm/	酵素
genetics 名詞	/dʒəˈnɛt.ɪks/	遺伝学
kidney 名詞	/ˈkɪdni/	腎臓
consequence 名詞	/ˈkɑn.sɪ.kwəns/	結果
autoimmune 形容詞	/ˌɔːtəʊɪˈmjuːn/	自己免疫の
carbohydrate 名詞	/kɑɹboʊˈhaɪdɹeɪt/	炭水化物, 含水炭素
endocrine 形容詞	/ˈɛnd.oʊ.kɹɪn/	内分泌
gland 名詞	/ɡlænd/	腺, グランド
intestine 名詞	/ɪnˈtɛs.tɪn/	腸管, 腸

動画に出てくる句動詞

単語	意味
come back 動詞	戻る, 帰る
get off 動詞	降りる
go down 動詞	降りる, 降下する
wear out 動詞	擦り減らす

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。

Glucose is one of your body's primary fuel sources.
How do you treat it and can you cure it?
Of course, we'll see you in the next video.

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
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	can be divided · are specialized · be absorbed
関係詞節 who / which + 節 — 人や物について情報を加える	glucose, which will · insulin, which are · control, which can
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	we've accumulated · we've ever had · has still increased

注意したい発音

話し手はwe're, doesn't, don'tなど、短縮形や弱形を34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。

「sh」と「zh」の音: dysfunction /dɪsˈfʌŋk.ʃən/, clinician /klɪˈnɪʃən/, specialize /ˈspɛʃəˌlaɪz/, modification /ˌmɑdɪfɪˈkeɪʃən/, sensation /sɛnˈseɪʃən/
長い単語（アクセントの位置に注意）: metabolic /mɛtəˈbɒlɪk/, subcutaneous /sʌbkjuːˈteɪnɪəs/, carbohydrate /kɑɹboʊˈhaɪdɹeɪt/, physiological /ˌfɪz.i.əˈlɑ.d͡ʒɪ.kəl/, sensitivity /ˌsɛn.səˈtɪv.ə.ti/

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: visceral /ˈvɪsəɹəl/, bloodstream /ˈblʌd.stɹɪim/, caloric /kəˈlɒɹɪk/, regulate /ˈɹɛɡ.jə.leɪt/, calorie /ˈkæləɹi/
/v/ — /b/ にならないように、上の歯を下唇に当てる: visceral /ˈvɪsəɹəl/, elevate /ˈɛləveɪt/, cavity /ˈkæv.ɪt.i/, sensitivity /ˌsɛn.səˈtɪv.ə.ti/, digestive /daɪˈdʒɛstɪv/
/f/ — 「フ」ではなく、上の歯と下唇で出す: dysfunction /dɪsˈfʌŋk.ʃən/, physiological /ˌfɪz.i.əˈlɑ.d͡ʒɪ.kəl/, classify /ˈklæs.əˌfaɪ/, metformin /mɛtˈfɔɹ.mɪn/, inflammatory /ɪnˈflæmət(ə)ɹi/

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。insulin, glucose, pancreas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: The REAL Reason Diabetes Is So Dangerous - 動画で英語スピーキングを学ぶ

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