Not forever.

不是永遠，

Just for say, five seconds?

只是比如說 5 秒鐘？

Would we just hold our breath?

我們會屏住呼吸嗎？

What would happen to the atmosphere?

大氣層會發生什麼變化？

What would happen to the environment?

環境會發生什麼變化？

This is What If and here's what would happen if the world lost oxygen for just five seconds.

這裡是《如果說》，如果世界失去氧氣五秒鐘，會發生什麼事。

Take a nice deep breath. Feel how satisfying that is?

深吸一口氣。 感覺很滿足嗎？

What you're breathing in is oxygen.

你呼吸的是氧氣。

And it takes up roughly 21% of our atmosphere with 78% being nitrogen.

它大約佔大氣的 21%，其中 78% 是氮氣。

Although it's not the most abundant gas in our atmosphere, it is the most important.

雖然它不是我們大氣中最豐富的氣體，但它是最重要的。

Without oxygen, plants, animals, water and us, humans wouldn't be where we are today.

沒有氧氣、植物、動物、水和我們，人類就不會變成今天的樣子。

Five seconds may not sound like a whole lot of time to be without oxygen.

對於沒有氧氣的情況來說，五秒鐘聽起來似乎不是很長一段時間。

Most of us can go at least 30 seconds without taking a breath, so it would happen too fast for your body to even notice.

我們大多數人至少可以在 30 秒內不呼吸，這發生得太快了，你的身體甚至無法注意到。

Your breathing would actually remain norma, but as for everything else, not so much.

你的呼吸實際上會保持正常，但至於其他一切，就不那麼正常了。

In just five seconds, the earth would look completely different.

只需五秒鐘，地球就會面目全非。

Without oxygen, you can say goodbye to the Hoover Dam, the Pantheon Dome and anything else made of concrete.

沒有氧氣，你就要跟胡佛水壩、萬神殿圓頂和其他由混凝土製成的東西說再見了。

These structures would instantly collapse.

這些建築會立即倒塌。

Oxygen acts as a special binding agent to concrete.

氧氣是一種特殊的混凝土結合劑。

Without it, concrete is just dust.

沒有它，混凝土只是灰塵。

Speaking of buildings, any untreated metal would instantly be fused together.

說到建築，任何未經處理的金屬都會立即融為一體。

This is because there's a layer of oxidation on metals that prevents them from welding together.

這是因為金屬上有一層氧化層使它們無法焊接在一起。

Without that layer, metals would instantly bind to each other.

如果沒有這一層，金屬就會立即相互結合。

If you happen to be relaxing at the beach at the time, expect a severe sunburn.

如果您當時正好在海灘放鬆，可能會被嚴重曬傷。

The ozone layer, our protection against the sun's UV rays is made of oxygen.

臭氧層是我們抵禦太陽紫外線的保護層，它是由氧氣組成的。

Take away the oxygen and the earth would become extremely dangerous.

奪走氧氣，地球將變得極其危險。

There would be nothing protecting us from the sun's UV rays.

沒有任何東西可以保護我們免受太陽紫外線的傷害。

In addition to a sunburn, our inner ear would explode.

除了曬傷之外，我們的內耳還會爆炸。

Losing oxygen means losing 21% of our air pressure.

失去氧氣意味著失去 21% 的氣壓。

A change in air pressure that drastic is equivalent to being at sea level and dropping down 2000 meters instantly.

如此劇烈的氣壓變化，相當於在海平面瞬間下降了2000公尺。

Our ears wouldn't have enough time to adapt.

我們的耳朵沒有足夠的時間去適應。

Having a good time yet? Well, don't expect it to last long.

玩得開心嗎？ 別指望它會持續很長時間。

Without oxygen, there's no fire.

沒有氧氣，就沒有火。

The combustion process in vehicles wouldn't be able to occur.

車輛中的燃燒過程將無法發生。

Any mode of transport that isn't electric will automatically fail.

任何非電力運輸方式都會自動失效。

Planes will fall from the sky and millions of cars will be stopped in their tracks.

飛機將從天上墜落，數百萬輛汽車將停在路上。

The sky would be completely dark.

天空將完全黑暗。

Before it hits the earth, light from the sun bounces off multiple particles in the air.

在到達地球之前，太陽光會被空氣中的多個粒子反射。

Without oxygen in the atmosphere, there are less things to bounce off and the sky will appear dark.

大氣中沒有氧氣，反射的物質就會減少，天空就會顯得黑暗。

Oh yeah, and while all this is happening, the earth's crust would completely crumble.

哦，對了，當這一切發生時，地殼會完全崩塌。

That's because Earth's crust is made up of 45% oxygen.

這是因為地殼由 45% 的氧氣組成。

The crust would crumble and continue to crumble until there's nothing left, sending you and everyone on the planet into a free fall.

地殼會崩塌並繼續崩塌，直到什麼都沒有剩下，讓你和地球上的每個人都自由落體。

Sound like fun? Probably not.

聽起來很有趣？可能不。

But luckily, you can take a deep breath of 21% oxygen, knowing this will never happen.

但幸運的是，你可以深呼吸 21% 的氧氣，並且知道這種情況永遠不會發生。

For more things that are fun to speculate on, keep checking back with What If.

想了解更多有趣的推測，請繼續查看《如果說》。