如果你在黑板上写字，下课时要擦掉。
If you write on the blackboard, rub it off at the end of the lesson.
他停止说话，开始在黑板上写字。
He stopped speaking, and went on to write on the blackboard.
粉笔是用来在黑板上写字，而钢笔是用来在纸上写字的。
Chalk is used to write on the blackboard while a pen on paper.
当大家都在外面的时候，偷偷在黑板上写字该是多么有趣的事啊！
What fun it would be to write on the chalkboard while everyone is outside.
哇！当大家都在外面的时候，偷偷在黑板上写字该是多么有趣的事啊！
Wow! What fun it would be to write on the chalkboard while everyone is outside.
哇！当大家都在外面的时候，偷偷在黑板上写字该是多么有趣的事啊！
Wow! What fun it would be to write on the chalkboard while everyone is outside.
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