Teacher: What are the four element of nature? Student: Fire, air, earth, and... and ... Teacher: And what? Just think it over, what do you wash your hands with? Student: Soap!
老师：自然界的四大元素是什么？
学生：火、气、和。。。和。。。
老师：和什么？想一想， 你用什么洗手的？
学生：肥皂。
