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to phrases
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 science
6
Electronics
1
Engineering geology
4
General
1
Hydroelectric power stations
2
Oil / petroleum
5
Technology
6
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