coarsing

例句：

1. 1. The car was coarsed before the paint job.
   汽车在涂装之前进行了粗磨。
2. 2. They coarsed the wood to make it stronger.
   他们给木头做了粗磨，使其更坚固。
3. 3. Coarsing is a necessary step in the polishing process.
   粗磨是抛光过程中的一个必要步骤。