mark check

例句：

1. 1. He marked the spot with a red marker.
   他用红笔在那个地点做了标记。
2. 2. The teacher marked the exam papers with a pen.
   老师用笔在试卷上做了标记。
3. 3. She marked her homework with an X.
   她用一个叉子标记了她的作业。