铅笔是一个细小的木棒，里面是黑色或其它颜色的材料，你可以用它来写字和化画。

A pencil is a thin stick with black or colored material inside it. You use a pencil to write and draw.

youdao

铅笔是一个好的工具。你可以用铅笔在文章边缘做注释，就不会对文本造成任何不可复原的毁坏。

A pencil is a good tool. You can use a pencil to make annotations in the margins of your text without doing any permanent damage to the text.

youdao

现在我们可以看到 DNA，看到铅笔写字的地方，这某程度上是一个全新的世界。

Now that we're actually able to look at the DNA and see where the pencil writings are, it's sort of a whole new world.

youdao

That's four items. Show up, sit down, and the first question is does anybody have a pen?

总共4件东西，你们来到，坐下，第一个问题是你们有带铅笔吗？

麻省理工公开课 - 固态化学导论课程节选