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大气成分
agric.	composition of atmosphere
desert.	atmospheric component
ecol.	constituent of atmosphere
life.sc.	atmospheric constituent
railw.	atmosphere specific
space	atmospheric composition; atmospheric constituents
tech.	air composition; atmosphere composition
wind.	atmosphere constituent

大气成分: 16 phrases in 7 subjects

Agriculture	1
Aviation	2
Earth sciences	2
Ecology	1
Environment	1
Space	7
Technology	2