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| |||
| 地下管道排水 | |||
| 密闭引流法 | |||
| 内陆水系; 暗沟 | |||
| 内排水系统 | |||
| 暗管排水 | |||
| 封闭水系 | |||
| 闭合引流术 | |||
| 内流水系; 关闭引流法; 闭合式排水; 闭式引流法; 闭流水系; 暗沟排水 | |||
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closed drainage : 8 phrases in 4 subjects |
| Hydroelectric power stations | 2 |
| Nursing | 3 |
| Surgery | 1 |
| Technology | 2 |
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