cotter file

例句：

1. 1.The carpenter used a cotter file to smooth the edges of the wood.
   木匠用锉刀来磨平木头的边缘。
2. 2.The tool is essential for filing and sanding metal surfaces.
   这个工具对于打磨金属表面是必要的。
3. 3. He carefully filed down the rough edges of the piece of furniture.
   他仔细地锉平了家具的粗糙边缘。