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垂拱 chuígǒng
hydroel.st. drop arch
met. blunt arch
tech. blunt arch (拱高度小于一半跨度者); depressed arch; drop arch (拱高度小于一半跨度者)
垂拱
: 13 phrases in 6 subjects
Agriculture2
Architecture1
Earth sciences1
General2
Project management1
Technology6