粉笔的用法和样例：
例句
-
我们学校同最近的一家商店每月订购50盒粉笔。
Our school contracted with the nearest shop for50 boxes of chalk a month. -
男孩子们在运动场的墙上用粉笔画上了球门柱。
The boys chalked out goalposts on the playground wall. -
把你自己身上掸掸--上面都是粉笔末。
Dust yourself down you're covered in chalk. -
老师用一支粉笔在黑板上写字。
The teacher wrote on the blackboard with a piece of chalk.
