coupling buckle

例句：

1. 1. The engineer used aspecial coupling to connect the pipes together.
   工程师使用一种特殊的连接件将管道连接在一起。
2. 2.The car's suspension system relies onprecise couplings to distribute weight evenly.
   汽车的悬挂系统依靠精确的连接件来均匀分配重量。
3. 3. Thecouple had to buy anew coupling for their old car.
   这对夫妇不得不为他们的旧车购买一个新的连接件。