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洞口 dòngkǒu
eng.geol. debouchure; mouth
hydroel.st. portal
tech. entrance of tunnel; mouth of the hole; mouth of the borehole; opening; portal area
wind. orifice
洞〔隘,岀人〕口
gen. gate
洞口: 134 phrases in 14 subjects
Air defense1
Architecture4
Aviation4
Bridge construction8
Electronics2
Engineering geology3
General6
Hydroelectric power stations9
Rail transport8
Refrigeration1
Space4
Technology74
Water resources1
Wind Energy9

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