 |
| |||
| 放出水，油，气孔 | |||
| 通气孔 | |||
| 排放孔 | |||
| 放出孔 | |||
| 排水孔 | |||
| 排泄孔 | |||
| 流水孔 | |||
| 放出口; 泪孔; 泄油井眼 | |||
| 泄水孔 | |||
| 放玻璃水板; 泄流孔; 放泄孔; 放水孔; 放料口; 放玻璃水口; 排污孔; 泄水; 排水; 泄水口 | |||
| |||
| 排泄孔 | |||
| drain hole: 18 phrases in 8 subjects |
| Automobiles | 2 |
| Drilling | 2 |
| Engineering geology | 2 |
| Hydroelectric power stations | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Rail transport | 3 |
| Technology | 3 |