stopper head

例句：

1. 1. The stopper head is designed to prevent leaks during transportation.
   这个塞子头设计用来防止运输过程中的泄漏。
2. 2. The engineer used a special stopper head to repair the leaky pipe.
   工程师使用一个特殊的塞子头来修理那个漏管。
3. 3. The stopper head was removed to inspect the inner workings of the machine.
   为了检查机器的内部工作，把塞子头取了下来。