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double-return siphon
archit. 乙字形存水弯管
construct. 乙字形存水弯管
ecol. 乙字存水弯
tech. 双网虹吸管; 双弯虹吸管; 乙字形存水弯; 乙字形弯管
double return siphon
bridg.constr. 双弯虹吸管

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