シャドーイング練習: The Insane Megastructure We Could Build in 31 Years - 動画で英語スピーキングを学ぶ

練習モードを選ぶ

各モードは全画面の練習ルームで開きます。

261 文

文が短すぎたり長すぎる場合は、Editをタップして調整してください。

You'll never see any of these gargantuan projects completed in person. But soon,

you'll know exactly what it would feel like to witness the launch of every multi -generational super construction project ever conceived.

From the realistic to the absolutely insane.

What would it be like to stand on these megastructures?

Could we ever realistically build any of these?

And could humanity ever finish a project that outlives everyone who starts it?

Now, what is a megastructure?

And do we have any already underway?

Well, simply put, a megastructure is just an extremely large man -made structure, like a building.

It's a project that, if completed, would overshadow any other object completed before it.

Think of what a skyscraper would look like to a caveman, and then multiply that by a million.

And while you're thinking of skyscrapers, imagine the biggest one you can.

The Burj Khalifa, at nearly one kilometer tall, is a structure that took six years to complete.

That's pretty impressive, right?

Well, lay it on its side and extend that out 170 times.

Now you've got a modern -day megastructure, and one that's actually being worked on today.

Ever heard of The Line?

That's its name, not something I came up with.

It's a 170 -kilometer -long city drawn ruler straight across the desert of northwestern Saudi Arabia.

When it's finished, it will house 9 million people living behind a mirrored wall

that rises half a kilometer above the shifting dunes.

The initial budget for this project was a jaw -dropping $500 billion U .S.

The line's design uses state -of -the -art construction techniques and environmentally sustainable practices.

It was designed to be a vision of what the future holds, a different concept of human livability.

All your daily needs are within a five -minute walk.

For longer trips, there's a high -speed rail system that transports you underground.

It will only take 20 minutes to go from one end to the other of this line.

Construction kicked off with thousands of workers and hundreds of machines.

And soon, we started to see a city emerging from the desert.

But work was suddenly suspended in September of 2024,

even though they'd only completed a tiny 2 .4 -kilometer section of the foundation.

Remember, the plan was 170 kilometers.

The project had already burned through 8 billion dollars.

Everything about the line is technologically feasible.

Nothing was missing from an engineering standpoint.

It could easily be the city of the future, so why the sudden stoppage?

A leaked audit estimated that the project was going to take 50 years longer than originally claimed,

and the actual cost would be $8 .8 trillion dollars.

That's roughly 1 ,600 times over budget.

Megastructure meet financial reality.

Fund managers got spooked and slammed on the brakes.

If this kind of mismanagement can kill a decades -long project like

The Line, well, megastructures in space take way longer.

How can a thousand -year project ever hope to be completed.

I mean, the ISS was built in 13 years with the cooperation of 15 countries,

but the projects we're talking about will take so long to complete

that multiple generations will live and die before construction is complete.

Is building them even possible?

In all of human history, do we have any examples of humans being coordinated and motivated enough to actually build something like a megastructure?

Now, you might already be thinking of an example of a megastructure built, like the Great Pyramids.

Mega monuments of towering stone built to carry the pharaohs into the afterlife, which surely took an eternity to build.

Well, written accounts from around

that time suggest it took about 20 years to build the Great Pyramid of Khufu not exactly the multiple lifetimes

we're looking for.

However, there is one interesting example of a building whose construction outlasted its architects and master builders by hundreds of years.

Though not necessarily intentionally.

The Cologne Cathedral.

It was the megastructure of its time.

Started in 1248, the drawings laid out the plans for the world's largest Gothic cathedral.

The design for the nave reached a staggering height of 43 .5 meters, that's 143 feet.

On the outside, the tower facade would be 157 meters, that's over 500 feet high.

The average person in 13th century Europe would have looked at it the way we look at a space shuttle launch,

or even a future moon base under construction.

And if you think about the relatively primitive construction technology they had at the time, it's nothing short of a miracle.

All the stone was quarried and cut by hand.

Only simple machines were available to help.

Ropes and pulley systems were used to hoist heavy stone blocks into place tens of meters into the air.

Remember that in 1248, the average lifespan of an artisan was only 40 or 50 years.

Three generations of master builders supervised the first phase, which lasted 200 years.

Generations of carpenters and stonemasons worked on it, passing down their skills and their jobs to their children and their children's children.

But then things changed.

Pilgrims stopped visiting.

Finances dried up and the work stopped.

The cathedral stood half -completed with an abandoned construction crane hanging from its south tower for 375 years.

It looked like it might never be completed, but new money was raised and luckily the original plans were found.

When construction resumed in 1823,

it was a testament to their genius that the engineering in the original medieval era plans were still sound.

And work continued for another 57 years.

Now when it was finally completed in 1880, 623 years after the first stone was laid,

the Cologne Cathedral was the world's tallest building.

And it's still considered to be a marvel of engineering and technological innovation.

And in some ways, it's never really complete.

Even today, it takes over 100 craftspeople to maintain it.

So yeah, I guess people can actually build something that takes multiple generations.

So what could people actually achieve with today's technology?

In the 1970s, physicist Gerard O 'Neill challenged the assumption that

Earth is the best place for humanity.

He thought that, frankly, we can do better.

And he came up with an idea to prove it.

But it was going to take a megastructure.

It was a simple solution, but on a grand scale.

Two massive counter -rotating cylinders turning in space at one rotation every two minutes.

The centrifugal force of the tube's rotation draws everything inside to the surface and replicates

Earth's gravity at a steady 1G.

Three strips of land contain cities, and three strips of windows let in sunlight.

A mirrored shutter system creates a light cycle to mimic

Earth's day and night.

The two structures are large enough to hold 7 million people.

Looking up from anywhere inside of its surface,

100

the ponds, gardens, and buildings of your neighbors hanging upside down above you are 8 kilometers away.

101

And looking down the full 32 kilometers of its length, the haze of the atmosphere would blur the tube's end.

102

Human -powered flight would become a popular pastime because as you left the interior surface,

103

the effects of the centrifugal force would fall away.

104

The closer to the center you propelled yourself, the lighter you'd become.

105

And at the very center of the tube, you'd become weightless.

106

Now, O 'Neill didn't invent the basic concept here.

107

He wasn't the first to design using the idea of centrifugal force, but he was the first to work out the details scientifically.

108

and to prove the feasibility of a cylindrical space colony.

109

He was as interested in imagining the possibilities as he was in actually building it.

110

Actually building it, that's always the problem, isn't it?

111

You see, we can dream up these plans and even start them here on Earth, but to actually start them up there,

112

where structures really go mega?

113

we're going to need efficient, constant access to space from Earth.

114

A permanent structure, like a tethered space elevator, is a must -have for humanity to take the next steps.

115

And like the O 'Neill Cylinder, the theoretical engineering of the space elevator has already been worked out.

116

It's an unimaginably strong cable made of a carbon nanotube composite,

117

and it's anchored to a floating platform in the Pacific Ocean.

118

From there, it stretches skyward 100 ,000 kilometers to its endpoint.

119

It can lift payloads of 18 tons at speeds of up to 320 kilometers an hour.

120

A trip to low

121

Earth orbit, first floor, would take an hour.

122

This could happen.

123

It's just around the corner, cosmically speaking.

124

Now, the materials needed to build a space elevator will have to be two or three times stronger than anything we currently have,

125

but we're quickly closing the technological gap.

126

Now, what if there was a faster way?

127

In 1980, British scientist Paul Birch proposed an orbital ring system for access to space from Earth.

128

It's a thin ring surrounding the planet in low Earth orbit.

129

The cables would be tethered to it and hang down to Earth.

130

How is this better than a space elevator?

131

A space elevator needs a geostationary anchor out in space to function.

132

An object connected to a cable 36 ,000 kilometers long.

133

No cable we can make is strong enough for a distance that long.

134

But Birch's orbital ring gets around this by building a ring in low

135

Earth orbit about 500 km high.

136

It would move faster than orbital speed, which is what would hold it up.

137

The ring is the anchor, so the cable only has to reach about 500 km down to the ground,

138

and a shorter cable needs far less strength.

139

The orbital ring around

140

Earth could be a great ladder to get our civilization up into space.

141

Birch's orbital ring, like O 'Neill's cylinder though, is limited by its creator's restrictions to only use real materials of the age.

142

But nanotechnologist Tom McKendry worked out what a space cylinder could be

143

if built from materials that don't exist yet diamond -like structures made with molecular nanotechnology.

144

His version of a space habitat has a radius of 460 kilometers.

145

It's more than 100 times O 'Neill's.

146

Now, at some point, the limitations of strength and resources become secondary,

147

and the factor holding us back from building more sophisticated and wilder megastructures is energy.

148

Today, Earth only intercepts a billionth of the Sun's total energy output.

149

But what if we could capture nearly all of it?

150

In 1960, a scientist named Freeman Dyson came up with a concept for a sphere the size of Earth's orbit.

151

It would be a shell that encompassed the Sun

152

and captured all of its energy output it it's a mind -blowing megastructure in concept size

153

and ambition it's the kind of technological device

154

that would give the human species access to an almost infinite energy source

155

and power a quantum leap in our civilization's development it would be a necessary energy upgrade

156

and star powered springboard to explore our galaxy.

157

Now, unfortunately, the sphere is mechanically impossible to maintain, and Dyson knew it.

158

It was theoretically sunk by Sir Isaac Newton in 1687, 273 years before Dyson even thought of it.

159

Newton's Shell Theorem states that a rigid shell around a gravitational object would feel the pull of gravity evenly everywhere,

160

until a tiny external force hits it, and then the whole thing would immediately begin to drift,

161

eventually crashing catastrophically into the star itself.

162

Dyson's beautiful sphere gets destroyed by physics.

163

In Dyson's 1960 paper, he used the word shell to describe his idea.

164

Science fiction writers ran with the idea of the solid continuous sphere, but Dyson knew better.

165

In follow -up letters, he described a swarm of independent objects, each with its own orbit around the sun.

166

Each object is a relatively simple piece of technology that we could manufacture today.

167

Really, what keeps us from doing this is the quantity of objects needed to orbit around the Sun.

168

And even if we could somehow build that many

169

Sun satellites, getting these objects to the right place, orbiting the Sun, would be a megaproject in itself.

170

It might sound like a question from a science fiction novel,

171

but have we ever seen any evidence that anyone else has built a Dyson Swarm?

172

Have we detected any alien civilizations in the universe that might have built one of these things?

173

Well, it's not so far out of a question because Dyson himself proposed it even as he was originally imagining his swarms.

174

He reasoned that if an extraterrestrial civilization were capturing or reprocessing the power of their sun with technology like a Dyson Swarm,

175

there would be a measurable shift in the infrared spectrum of light from that star.

176

It's something called a techno -signature.

177

In 2024, a group of researchers found seven potential candidates.

178

Patterns observed in their sun's brightness were consistent with those expected if an alien civilization had built a swarm around their sun.

179

But in 2026, in a follow -up,

180

all these examples were dismissed as naturally flaring stars rather than a sign of megastructures.

181

So we have no evidence of a Dyson swarm existing elsewhere in the universe.

182

Is it even possible to build one of these?

183

Where would we even get the enormous amounts of metal and materials needed for such a massive project?

184

And where would we even start?

185

Well, according to Oxford futurists Armstrong and Sandberg, the project would start on the surface of Mercury.

186

And it would begin with a simple one square kilometer area of solar panels.

187

And 90 % of the energy from these panels would be used to break down chemical bonds

188

and process raw materials from mercury.

189

And 10 % would be used to propel these materials into space.

190

The materials are used to build solar collectors, which are placed in orbit around mercury

191

and beam energy back to the surface for further processing and to launch more material into orbit.

192

The process expands exponentially.

193

Based on a series of five -year cycles of replicating, processing, and launching solar collectors,

194

the project takes 31 years.

195

In that time, more than half of mercury would be dismantled and processed into solar collectors that get distributed around the sun.

196

The result is a Dyson swarm, and humans capture the entire power of the sun.

197

And leveling up to highly speculative science fiction territory,

198

writer Larry Niven ran with Dyson's concepts and invented the wildly imaginative Ringworld.

199

It's a ring like a gigantic wedding band that circles the sun.

200

It might look like a fragile, narrow band from a distance, but Ringworld is a true megastructure.

201

It would be 1 .6 million kilometers wide from edge to edge and have 3 million times the surface of Earth.

202

Building this would take hundreds, if not thousands, of years.

203

We'd have to strip mine half the solar system to get resources to build this.

204

But now that we've conquered the output of the sun, what's left to build?

205

Well, there's more.

206

There's so much more.

207

So, you're a future super president of the solar system, and you decide we all need to go visit another galaxy.

208

So what do you do?

209

Build an Earth -sized spaceship to send us off to Andromeda?

210

Maybe the best way to travel between galaxies is to take the thing we can't live without along with us.

211

Thank you.

212

A shakadov thruster is a theoretical mirror big enough to push the sun

213

and all the planets gently across the galaxy on the pressure of radiation alone.

214

This is space travel in style.

215

A massive sun -sized engine pushing us through the galaxy

216

while a swarm of sun satellites captures all its available power feels pretty majestic.

217

You might stop to ask, have we reached peak megastructure here?

218

Well, what if I told you that a Dyson swarm is actually a rather primitive device?

219

Because Robert J.

220

Bradbury went a step further.

221

A Dyson swarm still has cracks that let some energy through, and its simple design emits waste heat.

222

So, what if the sun were surrounded by a series of nested concentric layers,

223

each layer capturing the waste heat of the layer inside it, approaching 100 % usage of our star's power?

224

This additional energy is what we would need to power a massive sun -sized supercomputer, known as a matryoshka brain.

225

It's called a matryoshka brain after the Russian matryoshka dolls that nest inside of one another.

226

And its purpose could be a digital utopia where all of humanity's consciousness is uploaded.

227

Each person surviving for eternity in paradise.

228

It's an insanely long way from being realistic.

229

It would need a structure like a space elevator

230

or an orbital ring to lift material into space at rates we've never seen before.

231

And landings on extraterrestrial soil with the intention to reduce the planet to dust

232

and convert all that material into an orbiting mega -computer planet.

233

It's nesting interconnected layers, powering civilization into the next level.

234

What level is that?

235

Well, in 1964, four years after Dyson launched his sphere into the collective imagination,

236

Soviet astrophysicist Nikolai Kardashev introduced the idea that extraterrestrial civilizations could be ranked by their energy consumption.

237

Known as the Kardashev Scale, he initially proposed three types.

238

A Type 1 civilization has achieved the technological means to harness all the available energy from its home planet.

239

We humans are on our way to a Type 1 status, but we've got a few steps to go.

240

Well, a lot of steps to go.

241

A Type 2 civilization would be a massive step up from

242

where we are now it would be a civilization capable of capturing and utilizing the total energy output of its host star.

243

Imagine capturing all the Sun's power and being able to use it all.

244

These civilizations would have built some variation of a Dyson Swarm or a Matryoshka brain and harnessed the power of their star.

245

A Type III civilization would have leveled up way beyond its

246

own solar system to tap into the energy at the scale of its entire galaxy.

247

And following in the theoretical footsteps of Kardashev, others have added on to his scale.

248

So a Type 4 civilization would be a civilization harnessing the energy of the entire observable universe.

249

A Type 5 conquering the multiverse.

250

Even Omega civilizations that exist in a quantum state, rewriting space, time, and reality itself.

251

As a barely type one, we've got our work cut out for us.

252

Okay, we've seen that physics can be harnessed, technology can be developed, and energy can be captured in almost infinite quantities,

253

but the question that really matters is,

254

are we going to be the generation that drops the thread and abandons the line to the Arabian sands?

255

Or are we going to be like the generation that picked up the thread and finished building the Cathedral of Cologne?

256

Or the generation that came together to build the International Space Station?

257

Can we see past our immediate future and launch a vision that lasts millennia?

258

Do we have the right stuff to become a Type 3 civilization?

259

Click on the video on screen now to find out.

260

Because that's a story.

261

for another What If.

アプリをダウンロード

流暢に話すために必要なすべて

AI発音採点文ごとに採点

IPA練習すべての音をマスター

単語学習自分の単語帳を作る

単語ゲーム遊びながら覚える

QRをスキャン

Download on theApp Store Get it onGoogle Play

同じチャンネル

FOR YOU

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「The Insane Megastructure We Could Build in 31 Years」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：space, sun, megastructure, civilization, energy。この動画には、シャドーイング用の文が261文、単語が3150語あります。音声の長さは25:10です。話す速さは1分あたり約125語で安定しており、シャドーイングしやすいペースです。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
civilization 名詞	/ˌsɪv.ɪ.laɪˈzeɪ.ʃən/	文明
orbit 名詞	/ˈɔɹ.bɪt/	軌道
capture 動詞	/ˈkæp.(t)ʃɚ/	捕獲する
galaxy 名詞	/ˈɡæl.ək.si/	銀河, 銀河系
cathedral 名詞	/kəˈθiːdɹəl/	大聖堂
sphere 名詞	/sfɪɚ/	球, 球体
output 名詞	/ˈaʊtpʊt/	出力
layer 名詞	/ˈleɪ̯ɚ/	層, 膜
shell 名詞	/ʃɛl/	殻, 貝殻
technological 形容詞	/ˌtɛk.nəˈlɑ.dʒɪ.kəl/	技術の
mercury 名詞	/ˈmɜɹkjəɹi/	水銀
mirror 名詞	/ˈmiɹɚ/	鏡, 姿見
fiction 名詞	/ˈfɪkʃən/	フィクション, 小説
strip 動詞	/ˈstɹɪp/	剥ぐ, 外す
humanity 名詞	/hjuˈmænɪti/	人類

動画に出てくる句動詞

単語	意味
find out 動詞	見出す, 調べる
pick up 動詞	拾う, 拾い上げる
take over 動詞	引き受ける

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。

Could we ever realistically build any of these?
That's its name, not something I came up with.
Actually building it, that's always the problem, isn't it?
You might stop to ask, have we reached peak megastructure here?

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	being worked · was designed · was suddenly suspended
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 already been worked · have we ever seen · Have we detected
関係詞節 who / which + 節 — 人や物について情報を加える	everyone who starts · speed, which is · collectors, which are

注意したい発音

話し手はwe've, we're, you'dなど、短縮形や弱形を23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: cathedral /kəˈθiːdɹəl/, theoretical /ˌθi.əˈɹɛt.ɪ.kəl/, thread /ˈθɹɛd/, thin /ˈθɪn/, tether /ˈtɛðəɹ/
「sh」と「zh」の音: civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, capture /ˈkæp.(t)ʃɚ/, shell /ʃɛl/, fiction /ˈfɪkʃən/, rotation /ɹoʊˈteɪʃən/
長い単語（アクセントの位置に注意）: civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, elevator /ˈɛləˌveɪtɚ/, technological /ˌtɛk.nəˈlɑ.dʒɪ.kəl/, humanity /hjuˈmænɪti/, theoretical /ˌθi.əˈɹɛt.ɪ.kəl/

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: orbital /ɔɹ.bət.l̩/, cathedral /kəˈθiːdɹəl/, theoretical /ˌθi.əˈɹɛt.ɪ.kəl/, realistic /ˌɹɪəˈlɪs.tɪk/, builder /ˈbɪl.dəɹ/
/v/ — /b/ にならないように、上の歯を下唇に当てる: civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, elevator /ˈɛləˌveɪtɚ/, gravity /ˈɡɹævɪti/, primitive /ˈpɹɪmɪtɪv/, impressive /ɪmˈpɹɛsɪv/
/f/ — 「フ」ではなく、上の歯と下唇で出す: sphere /sfɪɚ/, fiction /ˈfɪkʃən/, physics /ˈfɪz.ɪks/, infinite /ˈɪnfɪnɪt/, atmosphere /ˈætməsˌfɪɹ/

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。
通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
自分の声を録音して元の音声と比べます。civilization, orbit, capture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 Insane Megastructure We Could Build in 31 Years - 動画で英語スピーキングを学ぶ

練習モードを選ぶ

アプリをダウンロード

Earth Becomes a Moon | What If Saturn Took Over?

What If Humanity Became Type 7 Civilization?

What If We Dumped Our Trash into Volcanoes Full of 1,100°C Lava?

You Are Alive to Watch the Space Station Fall From the Sky

What If a Megalodon Shark Fought the Kraken?

What If Gravity Got 1% Stronger Every Second?

12 Things That Could Destroy Earth

What If the Kraken Was Real?

What If you Could See the 4th Dimension?

What If Russia Started World War 3?

What If You Were Swallowed ALIVE by a 60-Foot Sperm Whale?

What If a Needle Hit The Earth At The Speed Of Light?

What If | Channel Trailer | An Epic Exploration Of Possibilities

What If the Megalodon Shark Fought the Leviathan Whale?

What If the Megalodon Shark Fought the Mosasaurus?

Evolution of Dinosaurs in 10 Minutes

What If the Mosasaurus Never Went Extinct?

What If The Megalodon Never Stopped Evolving?

What If Megalodon Fought a 13-Meter Titanoboa in the Swamp?

What Happened After the DEADLIEST Asteroid Hit Earth?

China's $100BN Himalayan Mega Dam

Every Urban Planning Concept Explained in 9 Minutes

20% Speed of Light!! NEW Light Engine is INSANE!

This New Pyramid Theory Explains the Missing Evidence

Reinventing construction: Seven ways forward

What if the world runs out of sand? | The Royal Society

3 Ways AI Will Completely Change Your Life by 2029

Every Giant Number Explained

GO Expansion - Ontario's $27B Rail Electrification Plan

What They're Not Telling You About Data Centers

Is Chongqing REALLY a Cyberpunk City?