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	clamour clamoured clamourer clamourers clamouring clamours clamoursome clamp clamp cell clamp connection clamp down clamp down (on) clamp down on clamp on clamp screw clamp strake clampdown clampdowns clamped clamped down clamped down (on) clamped down on clamped on clamper clampered

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