Phytoplankton live at the ocean surface, where they pull carbon dioxide into the ocean while giving off oxygen.

"浮游植物生活在海洋表面，在那里他们把二氧化碳释放到海里，同时放出氧气。

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People and animals need oxygen to live.

人类和动物需要依靠氧气生存。

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The professor said: "It is a real mystery how these creatures are able to live without oxygen because until now we thought only bacteria could do this."

这真是难以理解的事情。 因为此前我们知道仅有细菌可以在无氧状态下存活。

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The red blood cells that carry oxygen only live within your circulation for about a month and so you have to continually be replacing cells that are dying and so there are cells that are proliferating.

携带氧的红细胞,在你的循环系统中的寿命只有一个月,因此你必须持续不断地更新衰老的细胞,所以就有在增殖的细胞

耶鲁公开课 - 生物医学工程探索课程节选

Anaerobic microbes--bacteria that live without oxygen--were generating the methane.

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Today, I am still amazed that the gills of a fish can get enough oxygen out of the water to live.

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It produces 75% of our oxygen, and eight out of 10 people live within 60 miles of it.

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