重返大气层的航天器受到重力的作用。

Spacecraft which are re-entering the earth's atmosphere are affected by g forces.

《牛津词典》

有的细菌利用光合作用所产生的氧气，进一步改变了大气层，使其成为今天的样子。

Bacteria that used oxygen produced by photosynthesis further altered the atmosphere to what we find today.

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后来一些天文学家提出，大气中的氨可能起到温室气体的作用。

Then some astronomers came up with the idea that atmospheric ammonia might have acted as a greenhouse gas.

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It's great because there's huge expectation that we are gonna bring this agency back, that we are gonna restore EPA with places, the protector of air, water and land.

这么做很好，因为人们期待着,环境保护署重新回到视线当中，期待环境保护署能够重新，发挥对大气，水以及土地资源保护作用。

普林斯顿公开课 - 领导能力简介课程节选