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- 空气主要由氮气组成。
Air consists chiefly of nitrogen.
- 大气中如果没有氧和氮,人就无法生存于地球了。
If it were not for oxygen and nitrogen in the air, no man could live on the earth.
- 地球上空气的大部分成分是氮气。
Nitrogen forms most of the Earth's air.
- 灯里充满了气体氮。
The lamp is full of gaseous nitrogen.
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