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探洞
el. exploration tunnel
hydroel.st. exploratory tunnel; exploratory adit
outd. caving
tech. exploratory drift; exploratory heading; investigation hole; trial heading; trial tunnel
el. exploratory heading
探洞: 30 phrases in 7 subjects
Electronics1
Engineering geology4
General3
Hydroelectric power stations6
Outdoor activities and extreme sports2
Sports2
Technology12