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| 管道工程系统指排水卫生设施 | |||
| 室内管道系统 | |||
| 抽送系统 | |||
| 污水系统; 室内管道工程系统; 污水粪便系统; 卫生设备系统; 卫生管道工程系统; 室内管沟系统; 室内管工系统 | |||
| plumbing system: 8 phrases in 2 subjects |
| Technology | 7 |
| United Nations | 1 |
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