He chalked the message on the blackboard.

他用粉笔把这条消息写在黑板上。

《柯林斯英汉双解大词典》

If you write on the blackboard, rub it off at the end of the lesson.

如果你在黑板上写字，下课时要擦掉。

《牛津词典》

He wrote the title on the blackboard, then copied out the text, sentence by sentence.

他把题目写在黑板上，然后一句一句地抄写了整篇课文。

《柯林斯英汉双解大词典》

I don't know where that is, that disappeared on the blackboard, then putting the time equal to 1 second into this formula.

我不知道我写在哪儿了,已经不在黑板上了,然后把时间等于1秒代入方程

耶鲁公开课 - 基础物理课程节选

By the way, you will find that I make quite a lot of mistakes on the blackboard.

顺便说一下,你们以后会发现,我的板书经常出错

耶鲁公开课 - 基础物理课程节选

Well, all this time int on the blackboard I always draw an int as a square.

嗯，向来,我在黑板上用一个正方形表示一个。

哈佛公开课 - 计算机科学课程节选

With such writing on the blackboard, the teachers' unions have reached deep into their pockets to fight the spectre of competition.

ECONOMIST: Lessons Cleveland can teach

Cap Lavin died overnight in San Francisco and a team assistant scrawled "Do It for Cap" on the blackboard in the locker room.

WSJ: St. John's loses 77-58 to No. 9 Orange on sad day

After that his fellow classmates put a thing on the blackboard.

NPR: Excerpt: 'The Mysterious Secret of the Valuable Treasure'