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伸缩弯管
archit.	expansion loop
bridg.constr.	expansion bending pipe
compr.	expansion bent
tech.	expansion bend; expansion pipe bend
伸缩补偿弯管
tech.	expansion bent; expansion loop

伸缩 弯管: 4 phrases in 3 subjects

Architecture	1
Hydroelectric power stations	1
Technology	2