closed end cap

例句：

1. 1.The machine has a closed end cap that prevents dust from entering.
   这台机器有一个密封端盖，防止灰尘进入。
2. 2.The engineer replaced the broken closed end cap with a new one.
   工程师用一个新的密封端盖替换了损坏的端盖。
3. 3.The closed end cap is designed to keep the gasket in place and prevent leaks.
   这个密封端盖的设计是为了保持垫圈的位置并防止泄漏。