You've got to pretty much take that chalk, and make a slurry out of it, put water, and dry it back up, put in a mold, and then you can have the chalk again, but you can't just glue it back together.

你得尽可能地收集它的碎片，把它做成粉浆，加水然后风干，放进模具，然后你就能重新得到这支粉笔，但是你不能简单地把它粘起来。

麻省理工公开课 - 热力学与动力学课程节选

Well how much sense does it make to ship water to the U.S. from France?

从法国进口水到美国有意义吗

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选