scraping straightedge

例句：

1. 1. Theold car was so dirty that wehad to scrape off the grimewith a brush.
   这辆旧车太脏了，我们不得不用刷子把污垢刮掉。
2. 2. The old lady scraped her fingernails on the sharpedge of the knife.
   老妇人的手指在刀尖上刮出了血。
3. 3. Thechildren were scraping the ice off thesidewalk with their skates.
   孩子们用他们的溜冰鞋在人行道上刮掉了冰。