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拱形结构
agric.	buttress
archit.	arched work
bridg.constr.	arched structure; arch construction
exhib.	arch
expl.	arch structure
tech.	arched construction; arched element; arch frame; arcual structure; arcuate construction
月面拱形结构
gen.	domes
拱形结构支架
archit.	arch element
拱形结构构型
auto.	arch configuration

拱形结构: 5 phrases in 2 subjects

Bridge construction	2
Technology	3