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穴洞 xuédòng
agric. cave; cavern
el. burrow
tech. grotto
穴洞
: 310 phrases in 24 subjects
Agriculture11
Animal husbandry3
Chemistry1
Dermatology1
Desert science31
Earth sciences14
Ecology4
Electronics6
Engineering geology45
Exhibitions1
Explosives and Explosive Ordnance Disposal4
General35
Golf2
Hydroelectric power stations5
Life sciences1
Metallurgy5
Multimedia1
Oil / petroleum28
Outdoor activities and extreme sports3
Rail transport2
Sports2
Submarines1
Technology103
Wind Energy1