white chalk

例句：

1. 1. The teacher used white chalkto write on the blackboard.
   老师用白粉笔在黑板上写字。
2. 2. Studentsoften use white chalk to highlightimportant points in their notes.
   学生们经常用白粉笔在笔记中突出重要点。
3. 3. During the exam, students will usewhite chalk to mark their answers.
   考试时，学生们将使用白粉笔标记他们的答案。