四减四等于几?
How much is four minus four?
One day, the teacher inquired Peter: "How much is four minus four?" Peter was tongue-tired.
一天,老师问彼得:“4减4等于几?”彼得张口结舌答不上来。
The teacher got angry and said: "What a fool! You see, if I put four coins in your pocket, but there is a hole in your pocket and all of them leak out, now what is left in your pocket?" "The hole," replied Peter.
老师生气地说:“真笨!你想,我要是往你口袋里放四个硬币,而你的口袋上有个窟窿,硬币全漏掉了,那么,你衣袋里还剩下什么?”“窟窿。”彼得答道。