The Fourth Element
第四元素

Teacher: What are the four element of nature?
老师：自然界的四大元素是什么？

Student: Fire, air, earth, and... and ...
学生：火、气、和。。。和。。。

Teacher: And what? Just think it over, what do you wash your hands with?
老师：和什么？想一想， 你用什么洗手的？

Student: Soap!

学生：肥皂。