大气中含量很少的气体组成成分。
地球大气含有大约78%的氮气、21%的氧气和痕量的水蒸气、氩气和二氧化碳等其它气体。
The atmosphere is roughly 78 percent nitrogen, 21 percent oxygen, with trace amounts of water, argon, carbon dioxide and other gases.
挥发性卤代烃是大气中的痕量气体，对臭氧层损耗和温室效应有重要作用。
Volatile halocarbons are important atmospheric trace gases, which play significant roles in stratospheric ozone depletion and in the greenhouse effect.
氧化亚氮(N2O)是大气中的一种痕量气体，也是一种重要的温室效应气体，还可使臭氧层遭到破坏。
Nitrous oxide (N2O) is a trace gas in the atmosphere, which contributes both to the greenhouse effect and to the destruction of stratospheric ozone.
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