单词	back vent
释义	back vent noun : a ventilating pipe attached to a waste pipe on the sewer side of its trap to prevent siphonage back venting noun Word History First Known Use 1915, in the meaning defined above
随便看	rosin ester rosin oil rosin plant rosin rose rosin soap rosin spirit rosin spirits rosinante rosinate rosinates rosinback rosined rosined soap rosiness rosinesses rosing rosining rosinols rosinous rosins rosinweed rosinweeds rosinwood rosiny rositae

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