What is it? It is a blackboard.

这是什么？这是一块黑板。

youdao

John saw a blackboard with a note written on it.

约翰看到一块黑板，上面写着一条留言。

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He showed up at Zeng's home the next day with a blackboard, a ruler and a box of chalks.

第二天，他带着一块黑板、一把尺子和一盒粉笔来到曾的家里。

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Like a blackboard that's been completely erased, we now have the very same blackboard, and now we start writing new things on it.

就像是被擦干净的黑板一样，我们得到的是完全一样的黑板，重新开始在上面写东西。

耶鲁公开课 - 死亡课程节选

You're going to find out, you know, one of these years when you start teaching that when you get really close to a blackboard, you just cannot think.

过几年以后,你们渐渐就会发现,当你开始教课,当你离黑板真的很近的时候,你就没法思考了

耶鲁公开课 - 基础物理课程节选

It happens. Fortunately, while sitting in jail awaiting trial, the slow thief decided to figure what was wrong. And, amazingly enough, he had studied mathematics. And had a blackboard in the cell. So he was able to work it out.

失主叫了警察然后小偷最后被抓进了监狱,幸运的是这个贼做来牢房里,等待判决时发现了自己的错误,它很惊人的学习过数学，牢房里,还有一个黑板，它可以把题目算出来了。

麻省理工公开课 - 计算机科学及编程导论课程节选

Today's kids do have it better--they'll never know the sound of fingernails screeching across a blackboard.

FORBES: Magazine Article

Unless bad schools are indeed closed, his scheme will be as much good as a blackboard with no chalk.

ECONOMIST: School reform

Most of the stereotypical photographs of scientists studying rows of equations on a blackboard are instructors explaining discoveries already made.

WSJ: Great Scientists Don't Need Math