sanding

例句：

1. 1. The car was sanded down to remove the scratches.
   汽车被打磨掉划痕。
2. 2. Sanding is an essential step in the finishing process.
   砂光是完成工艺中必不可少的一步。
3. 3. Sanding is a time-consuming process that requires precision and skill.
   砂光是一个耗时的过程，需要精确和技巧。