Teacher: If I cut a beefsteak in half and then cut the half in half, what do I get?Tommy: Quarters.Teacher: And then if I cut it twice again?Tommy: Hamburger.

老师：如果我把一块牛排切成两半的两半，我能得到几块儿？汤米：四块。老师：那我要是再切两次，我能得到什么呢？汤米：汉堡。