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| polar air; mass | |||
| polar air mass | |||
| Pc polar continental air mass; polar air mass | |||
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| polar air | |||
| 极地气团: 14 phrases in 6 subjects |
| Agriculture | 1 |
| Desert science | 2 |
| Earth sciences | 3 |
| General | 2 |
| Space | 3 |
| Technology | 3 |
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