一氧化二氮又叫做笑气。
结果：一氧化二氮成为一种早期的麻醉剂。
As a result: Nitrous oxide became an early form of anesthesia.
全球的一氧化二氮排放量中大约有三分之一是由人类活动造成的。
About a third of global nitrous oxide emissions are from human activity.
空气是成立的三种主要类型的气体：氧，二氧化碳和氮。
Air is made up of three main types of gases: oxygen, carbon dioxide, and nitrogen.
氧、二氧化碳、氮是动植物生命所必需的。
Oxygen, carbon dioxide, and nitrogen are essential for animal and plant life.
氧、二氧化碳、氮是动植物生命所必需的。
Oxygen, carbon dioxide, and nitrogen are essential for animal and plant life.
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