round edge joint file

例句：

1. 1. This is a new design for the round corner joint file.
   这是一种新的圆形角落接合文件设计。
2. 2.The engineer used this round corner joint file to connect the two pieces of metal together.
   工程师使用这种圆形角落接合文件将两块金属连接在一起。
3. 3. The round corner joint file was designed to make assembly easier and more efficient.
   这种圆形角落接合文件的设计是为了使组装更加容易和高效。