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拱心
archit. head (石)
bridg.constr. arch core
el. arch crown; crown
hydroel.st. arch-core
tech. arched center; arched core; center of arch; centre of arch
拱心石
gen. head
拱心: 195 phrases in 12 subjects
Architecture23
Bridge construction16
Construction2
Earth sciences1
Electronics6
Engineering geology4
Explosives and Explosive Ordnance Disposal1
General4
Hydroelectric power stations26
Metallurgy3
Technology108
Water resources1

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