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。