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	chavvier chavviest chavvy chaw Chawasha chawashas chawbacon chawbacons chawbuck chawdron chawed chawers chawing chawl chawn chawng chawngs chaws chawstick chay chay-cher chaya chayaroot chayas chayma

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