It's not the most interesting physical object in the world, but it's a whole lot more interesting than a piece of chalk.

它虽不是这个世界上最吸引人的物理对象,但它能干的事比一根粉笔能干的有趣多了

耶鲁公开课 - 死亡课程节选

It can do all sorts of things a piece of chalk can't do.

它能干一堆粉笔干不了的事

耶鲁公开课 - 死亡课程节选

But suppose you are in a train and you're moving past me and you look at this piece of chalk.

但假如你在火车上,从我面前驶过,你看着这支粉笔

耶鲁公开课 - 基础物理课程节选

A piece of chalk can be broken.

一根粉笔可以被破坏。

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Here's a piece of chalk.

这有一根粉笔。

耶鲁公开课 - 死亡课程节选