Plants recycle carbon dioxide and create oxygen, which we need to breathe.

植物吸收二氧化碳释放我们呼吸的氧气。

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Increase of carrier addition will result in the decreased oxygen transfer efficiency, shortened recycle time, mixing time as well as the decrease of air content.

载体加入量增加，会导致氧传递性能下降，循环时间和混合时间缩短，气含率减小。

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But what's novel about the CEAC design is that it incorporates a bio-regenerative life-support system -- the kind of technology that could one day not only feed an outpost on the moon or Mars, but also provide it with oxygen and recycle its water.

CNN: To boldly grow where no one has grown before