Higher oxygen levels also allowed plant eaters to be enormous.

更高的氧气水平同样让以植物为食者长得巨大。

Prolonged exposure to high pressure oxygen can lead to dizziness, convulsions, and eventually death.

长时间暴露在高压氧气下会导致头晕、抽搐，最终导致死亡。

With a higher oxygen level, you'd notice you that have much more energy.

随着氧气含量增高，你会发现自己有更多能量。

A high oxygen level allowed dinosaurs, the dominant life form, to grow to immense sizes.

较高的氧气含量使得当时占统治地位的生物——恐龙能长成庞然巨物。

This happens when humans are exposed to higher oxygen levels than their bodies are normally used to.

氧中毒发生在人类突然接触到过量氧气情况下。

In summer, you may have lower risk of altitude sickness because the air has a higher oxygen content than in other seasons.

夏天游玩出现高原反应的风险较低，因为空气中的氧气含量高于其他季节。

It's thought that high oxygen levels may drive extreme growth in some species, while the colder temperatures promote longer life spans, giving animals the opportunity to grow massive.

这一特性被称为巨人症，并仍然是个谜，高氧浓度被认为也许促进了一些物种的极端生长，而冰冷的水温延缓了寿命。