| 释义 | drum trapdrum trap[′drəm ‚trap]  (engineering) In plumbing, a trap in the form of a cylinder with a vertical axis that is fitted with a removable cover plate.drum trap drum trap  In plumbing, a cylindrical trap, with its axis in a vertical direction, having a cover plate which may be unscrewed for access; commonly used on the drainpipe from a bathtub or under a bathroom floor. |