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壁凹〔洞,板〕
gen. bay
壁凹〔龛〕
gen. recess
壁凹
tech. recess
壁 凹: 29 phrases in 11 subjects
Agriculture1
Architecture2
Bridge construction1
Drilling1
Electronics2
Engineering geology1
General3
Hydroelectric power stations1
Metallurgy1
Oil / petroleum4
Technology12