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导洞
archit. head
eng.geol. drift heading; pilot bore; pilot tunnel; pioneer tunnel
hydroel.st. pilot drift tunnel; heading; pilot; pilot drift; pilot hole
导洞隧道施工中为增加开挖的临空面，或探查掌子面前方地质条件,并为整个隧道导向而开挖的坑道
expl. guide adit; heading
导洞〔坑〕
gen. pilot
隧道导洞
met. pilot tunnel
隧道、坑道施工的导洞
tech. approach adit
隧道掘进用导洞
tech. heading
导洞: 112 phrases in 13 subjects
Air defense3
Architecture2
Construction2
Desert science1
Electronics9
Engineering geology6
Explosives and Explosive Ordnance Disposal1
Hydroelectric power stations17
Metallurgy1
Mining1
Space1
Technology66
Wind Energy2

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