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| composition of air | |||
| composition of atmosphere | |||
| atmospheric composition The chemical abundance in the earth's atmosphere of its constituents including nitrogen, oxygen, argon, carbon dioxide, water vapour, ozone, neon, helium, krypton, methane, hydrogen and nitrous oxide (大气成分中的化学成分，包括氮，氧气，二氧化碳，氦，氩，氪，氙，以及水蒸气，甲烷，氢气，臭氧，氮氧化物。) | |||
| atmospheric composition | |||
| air composition | |||
| 大气组成: 5 phrases in 4 subjects |
| Aviation | 1 |
| Environment | 2 |
| Space | 1 |
| Technology | 1 |