blot one's copybook

例句：

1. 1.She blotted the ink from her paper before she started writing.
   她在开始写字之前，把纸上的墨水擦掉了。
2. 2.The stain on the carpet is difficult to remove.
   地毯上的污渍很难去除。
3. 3. He blotted his forehead with a tissue.
   他用纸巾擦了擦额头。