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| air contamination region; air contamination zone; air pollution region; air shed | |||
| air pollution zone | |||
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空气污染区 : 20 phrases in 7 subjects |
| Earth sciences | 8 |
| Ecology | 1 |
| Environment | 1 |
| Name of organization | 1 |
| Space | 2 |
| Technology | 3 |
| Wind Energy | 4 |
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