taperer

例句：

1. 1. The tapering of the pipe is necessary for proper functioning.
   管道的缩径是为了正常工作所必需的。
2. 2. The flattening of the surface will make it easier to clean.
   表面平坦化将使清洁更容易。
3. 3. The tapered end of the screw makes it easy to fit into tight spaces.
   螺丝的锥形端使得它能够轻松地装入狭小的空间。