couplings

例句：

1. 1. The engineer designed the new machine to have precise couplings.
   工程师设计了这台新机器，具有精确的连接件。
2. 2. The robotic arm has a unique design that minimizes the need for couplings.
   这个机器人手臂有一个独特的设计，可以减少对连接件的需求。
3. 3.The scientists found that the new material had better couplings than traditional materials.
   科学家们发现，这种新材料的连接件比传统材料更好。