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| 地下洞室 | |||
| 室为某些专门用途在井下开凿和建造的、断面较大或长度较短的空间构筑物。按其作用分为主要硐室和辅助硐室两类。主要硐室有马头门、主排水泵硐室、井下主变电硐室等，辅助硐室有井下电机车库及修理间、井下变流室、消防材料库、井下等候室等 | |||
| 地下峒室 | |||
| 地下室 | |||
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underground chamber : 6 phrases in 2 subjects |
| Hydroelectric power stations | 2 |
| Technology | 4 |
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