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to phrases
flat arch
bridg.constr. 坦拱
hydroel.st. 平拱; 扁拱
industr. 平〔扁〕拱
met. 平式炉顶
tech. 单砖拱; 平碹
flat arch: 20 phrases in 5 subjects
Architecture2
Bridge construction1
Hydroelectric power stations2
Metallurgy1
Technology14