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	cashbook cashbooks cashbox cashboxes cashboy exchanging for Exchangite exchangites excheat exchequer exchequer bill exchequer bond Exchequer of the Jews exchequers excide excided excides exciding excimer laser excimers excipient excipients exciple exciples excipula

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