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| 保持水分 | |||
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holding moisture : 28 phrases in 11 subjects |
| Agriculture | 6 |
| Desert science | 2 |
| Electronics | 1 |
| Engineering geology | 2 |
| Hydraulics | 1 |
| Hydroelectric power stations | 2 |
| Life sciences | 1 |
| Metallurgy | 2 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 9 |
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