rotating plug

例句：

1. 1.The machine needs a rotating plug to turn it on.
   这台机器需要旋转塞子才能启动。
2. 2. The engineer used a rotating plug to fix the leaky pipe.
   工程师用旋转塞子来修理漏水的管道。
3. 3.The rotating plug was designed to prevent water from flowing backwards.
   旋转塞子的设计是为了防止水反向流动。