As a result: Nitrous oxide became an early form of anesthesia.
结果：一氧化二氮成为一种早期的麻醉剂。
About a third of global nitrous oxide emissions are from human activity.
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。
The purpose is to observe the effect of nitrous oxide in abortion.
目的观察笑气吸入在人工流产中的效果。
The purpose is to observe the effect of nitrous oxide in abortion.
目的观察笑气吸入在人工流产中的效果。
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