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| 积雪控制 | |||
| 堆雪控制; 流沙治理 | |||
| drift control: 10 phrases in 7 subjects |
| Air defense | 1 |
| General | 1 |
| Geophysics | 1 |
| Rail transport | 1 |
| Space | 2 |
| Technology | 2 |
| Wind Energy | 2 |
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