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岩穴 yánxué
gen. abra
bridg.constr. cave; cavern
dril. vug
germ., desert. halbbohle
hydroel.st. abri; rock pocket
tech. grotto
岩穴
: 25 phrases in 7 subjects
Desert science6
Electronics1
Engineering geology4
General1
Hydroelectric power stations2
Oil / petroleum5
Technology6