 |
| |||
| 坑; 穴; 锅穴 | |||
| 坩埚炉; 水口砖孔 | |||
| 路面坑槽; 路面凹 (坑); 圆洞; 窝穴; 坑槽; 锅穴 (坑); 壶穴; 地穴; 沼穴; 海底圆谷; 潭; 水洞; 竖井; 冰川壶穴; 凹坑; 凹处; 路面凹坑; 路面上的坑洞 | |||
| |||
| 路面涡穴 | |||
| 壶〔水，涡〕穴; 地窝 | |||
| 锅穴; 坑洼; 路面凹坑 | |||
| 路面坑槽; 深洞 | |||
| 坑洞 | |||
| |||
| 路面坑槽 | |||
| 坑槽 | |||
| pot-hole: 6 phrases in 3 subjects |
| Engineering geology | 1 |
| Hydroelectric power stations | 2 |
| Technology | 3 |