return flange

例句：

1. 1. The car's flange is designed to fit perfectly into the door frame.
   这辆车的凸缘设计得能完美地适配车门框架。
2. 2. The metal flange was welded to the pipe for added strength.
   金属凸缘被焊接到管道上以增加强度。
3. 3. The flange on the machine is used to adjust the level of the workpiece.
   机器上的凸缘用于调整工件的水平位置。