mark counting check

例句：

1. 1. He marked the spot with a marker before writing his name.
   他在写字前用马克笔在那个地点做了标记。
2. 2. The teacher marked the students who answered correctly.
   老师给答对的学生打了勾。
3. 3. Mark your chalk on the board so you won't forget where you left it.
   在你的黑板上标出你的粉笔，这样你就不会忘记你把它放在哪里了。