flange key

例句：

1. 1. The flange key was used to secure the joint between the two pieces of metal together.
   凸缘键用于将两块金属连接在一起。
2. 2.The flange key was designed to prevent the two parts from moving apart during operation.
   凸缘键设计用来在操作过程中防止两部分分开。
3. 3. The flange key was used as a fastener to hold the assembly together.
   凸缘键用作紧固件，以保持组件的连接。