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| 纯洁空气 | |||
| 纯净空气; 晴空 | |||
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clear air : 26 phrases in 11 subjects |
| Air defense | 1 |
| Aviation | 7 |
| Desert science | 1 |
| Earth sciences | 1 |
| Economy | 1 |
| Environment | 1 |
| General | 6 |
| Securities | 1 |
| Space | 5 |
| Technology | 1 |
| Wind Energy | 1 |
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