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to phrases
barrel arch
archit.
bridg.constr. 板拱; 圆筒拱
el. 桶形拱
hydroel.st. 筒形拱
tech. 筒式拱桥; 筒拱
barrel arch
: 18 phrases in 5 subjects
Architecture3
Bridge construction1
Electronics3
Hydroelectric power stations2
Technology9