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	key industry key job Key Largo key letter key light key lime key lime pie key line key money key of art key of life key pattern key pipe key plate key plug key ring key seat key signature key station key to key turner key up chebecs chebog Cheboksary

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