One day, the teacher inquired¹ Peter: "How much is four minus four?" Peter was tongue-tired. 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.

 

一天，老师问彼得：“4减4等于几？”彼得张口结舌答不上来。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。

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