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verb | adjective | to phrases
| |||
| 使变稀少薄，疏; 使疏松; 使变纯净; 抽真空; 排气; 使纯化; 使精炼〔选〕 | |||
| |||
| 变稀少薄，疏的; 被抽空的; 变纯净的; 极高的; 精炼〔选〕的 | |||
| 变稀少薄，疏的 | |||
| rarefied: 21 phrases in 7 subjects |
| Aviation | 2 |
| Drilling | 1 |
| Earth sciences | 1 |
| Mountaineering | 1 |
| Rail transport | 1 |
| Space | 8 |
| Technology | 7 |
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