suction overfall

例句：

1. 1.The suction overfall is causing themachine to slow down.
   吸力溢出导致机器速度变慢。
2. 2. The engineer used a suction overfall to remove the debris fromthe tunnel.
   工程师使用吸力溢出清除隧道内的碎片。
3. 3. The suction overfall wasdesigned to prevent water from flowing into thebuilding.
   吸力溢出设计用来防止水流入建筑物。