chalk resistance

例句：

1. 1. The teacher used chalk to illustrate the concept of gravity on the blackboard.
   老师用粉笔在黑板上解释了重力的概念。
2. 2. The student's handwriting was difficult to read because of his poor chalk resistance.
   学生的书写因为粉笔抗性差而难以辨认。
3. 3.The new paint has excellent chalk resistance, making it suitable for use in classrooms.
   新油漆具有极好的粉笔抗性，适合用于教室使用。