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	native lime native millet native mistletoe native mulberry native myrtle native olive native orange native peach native pear native pheasant native plum native pomegranate native porcupine native potato native quince native rabbit native rat native sarsaparilla native sloth native soil native son native sparrow native speaker native state native teak

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