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| 跌水竖井 | |||
| 沉井; 沉井法开凿竖井; 跌水井 | |||
| 溜井以自然下落方式运输所采矿石的小立井,也叫漏斗天井，参见 draw shaft；orepass | |||
| 跌水式竖井 | |||
| 溜井; 自重运输井筒; 跌水竖井; 倾卸轴 | |||
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drop shaft : 7 phrases in 2 subjects |
| Automobiles | 1 |
| Technology | 6 |
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