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| 导洞; 导坑 | |||
| 超前导硐掘进大断面隧道时，宜先超前掘进一个小断面的导硐以探明地质条件，然后扩大到隧道的全断面。这样作业面多工程安全度高，且能同时进行浇灌拱部和边墙的混凝土作业。它有上半断面超前掘进、侧导硐超前掘进、下导硐超前掘进和环形导硐超前掘进等几种方法 | |||
| 隧道导洞 | |||
| 导向隧道; 超前导洞; 前辟导洞 | |||
| pilot tunnel: 7 phrases in 4 subjects |
| Explosives and Explosive Ordnance Disposal | 2 |
| Hydroelectric power stations | 1 |
| Space | 1 |
| Technology | 3 |
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