シャドーイング練習: How is glass made? - 動画で英語スピーキングを学ぶ

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72 文

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Hi, it's Doug.

I recently came across this unbelievable video.

It was taken at a hotel in Texas where on the roof of the hotel they have this pool

that hangs off the edge and it has a glass bottom.

Look at this.

Would you go in there?

Would you trust this glass?

Someone named Benjamin has a question about glass.

Let's give him a call now.

Hi, Doug.

Hi, Benjamin.

I have a question for you.

How is glass made?

That's a great question.

It's funny, right?

Think about just how many objects around you are made of glass.

Without glass, we'd have no windows, no windshields for our cars, no No drinking glasses or eyeglasses.

No skyscrapers or smartphones.

And yet, it's really not obvious at all where glass comes from.

Like if you're sitting there and you have a table or a desk in front of you like this, that's wood.

I'm guessing you know that wood comes from a tree.

Or this statue here is carved from stone.

You know where that comes from. But glass?

Glass is a material that has to be made.

How do they make it?

Where does it come from?

Before I say anything more, now would be a good time to pause the video and discuss.

Okay, you ready?

Well, believe it or not, Glass is made by taking a bunch of sand and getting it so hot that it melts.

It's one of the most amazing things to watch how it's made because in order to melt sand, you have to use a special type of oven that can get super hot.

It's called a furnace or a kiln.

Here you can see someone loading some sand into the furnace.

Once it gets hot enough, it will melt or become liquid.

And when you get something this hot, you can see it glows, just like lava.

This isn't lava though, it's molten sand.

And as it cools, it will start to look more familiar to you.

It becomes solid glass.

To make a flat sheet of glass, like you'd use for a window, they melt sand until it's molten.

Then they pour it out and roll it into a flat shape like this, and carefully allow it to cool.

More fancy objects, like a glass vase, are even more fun to watch.

This involves a special skill called glass blowing.

You can see here, it starts with this person taking a big glob of molten sand

and getting it on the end of a hollow pipe.

Then she blows air into the pipe.

You can actually blow a bubble into it, which might end up being the open part of the vase.

The molten glass has a similar thickness as honey.

They carefully shape it the way they want it and keep turning it and turning it.

As it cools, it becomes solid.

Artists can make amazing sculptures with glass.

Believe it or not, this artist is making a glass swan.

So that's how glass is made.

But it's kind of weird, isn't it?

I mean, how did people ever discover that if you melt sand, it makes glass?

We've been making glass for a long time.

So long ago now that no one knows for sure who was the first person to discover

that if you melt sand it makes glass.

But some of the earliest objects made of glass come from ancient Egypt, a place covered in desert sand.

Could it be that someone long ago had a campfire

and noticed that the heat of their fire melted the sand beneath it?

No one knows for sure, but it's possible.

That's all for this week's question.

Thanks Benjamin for asking it.

Now for the next episode, there's a lunar eclipse that's going to happen.

I reached into my question jar and chose three questions about lunar eclipses that I'm thinking about answering.

When this video is done playing, you'll get to vote on one.

You can choose from, what's the difference between a solar and lunar eclipse?

Why does the moon turn blood red during a lunar eclipse?

Or where does the word eclipse come from?

So submit your vote when the video's over.

I wanna hear from all of you watching.

There are mysteries all around us.

Stay curious and see you next week.

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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B1レベルのスピーキングレッスンは、動画「How is glass made?」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：glass, sand, melt, eclipse, molten。この動画には、シャドーイング用の文が72文、単語が728語あります。音声の長さは4:28です。話す速さは1分あたり約163語で、日常会話に近い自然なペースです。単語の82%は英語の頻出3,000語に含まれます。残りは練習の前に確認しておきましょう。全72文のうち14文が疑問文なので、疑問文のイントネーションや短い受け答えの練習に向いています。

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
melt 動詞	/mɛlt/	溶ける, 溶かす
eclipse 名詞	/ɪˈklɪps/	食, 蝕
vase 名詞	/veɪ̯s/	花瓶
furnace 名詞	/ˈfɝnɪs/	窯, 溶鉱炉
lava 名詞	/ˈlɑvə/	溶岩
pipe 名詞	/ˈpaɪp/	笛
campfire 名詞	/ˈkæmpˌfaɪ̯ɚ/	キャンプファイヤー
skyscraper 名詞	/ˈskaɪˌskɹeɪpɚ/	超高層ビル, 摩天楼
windshield 名詞	/wɪnˈʃiːld/	フロントガラス
thickness 名詞	/ˈθɪknəs/	厚み
swan 名詞	/swɑn/	鵠, 白鳥
sculpture 名詞	/ˈskʌlpt͡ʃɚ/	彫刻
hollow 形容詞	/ˈhɑloʊ/	空っぽ, くぼんだ
pause 名詞	/pɔːz/	休止, 中断
oven 名詞	/ˈʌ.vn̩/	オーブン

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。

Would you go in there?
Would you trust this glass?
Let's give him a call now.
We've been making glass for a long time.

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	was taken · are made · is carved
最上級 the -est / the most … — グループの中で一番	the most amazing · the earliest
現在進行形 am/is/are + -ing — 今まさに、または最近起きていること	you're sitting · I'm guessing · is making
「will」の未来表現 will + 動詞 — その場の決定、約束、予測	will melt · will start · you'll get

注意したい発音

話し手はI'm, isn't, wannaなど、短縮形や弱形を10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: thickness /ˈθɪknəs/, beneath /bɪˈniːθ/

日本語話者が苦手な音：

/v/ — /b/ にならないように、上の歯を下唇に当てる: vase /veɪ̯s/, lava /ˈlɑvə/, oven /ˈʌ.vn̩/, unbelievable /ˌʌnbɪˈliːvəbl̩/, involve /ɪnˈvɑlv/
/f/ — 「フ」ではなく、上の歯と下唇で出す: furnace /ˈfɝnɪs/, campfire /ˈkæmpˌfaɪ̯ɚ/, smartphone /ˈsmɑɹtfoʊn/
子音の連続 — 間に母音を入れない: melt /mɛlt/, eclipse /ɪˈklɪps/, campfire /ˈkæmpˌfaɪ̯ɚ/, skyscraper /ˈskaɪˌskɹeɪpɚ/, windshield /wɪnˈʃiːld/

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。melt, eclipse, vase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: How is glass made? - 動画で英語スピーキングを学ぶ

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