 |
| |||
| 污水处理系统 | |||
| 污水系统; 排水沟道 | |||
| 下水道系统 | |||
| 排污水系统 | |||
| 生活污水系统 | |||
| 排污系统 | |||
| 污水管道系统 | |||
| |||
| 下水道系统; 污水系统 | |||
| sewage system: 52 phrases in 11 subjects |
| Agriculture | 1 |
| Desert science | 1 |
| Earth sciences | 1 |
| Ecology | 2 |
| Engineering geology | 3 |
| Environment | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Nautical | 4 |
| Technology | 35 |
| Water resources | 2 |