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One day, the teacher inquired Peter: "How much is four minus four?" Peter was tongue-tied. 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，都是問彼德：“四減四等于幾？”彼德張口結舌答不上來。 老師生氣地說：“真笨！你想，如果我放四個硬幣在你的口袋里，但你的口袋里有個窟窿，結果四個硬幣都漏掉了。那么，你的口袋里還有什么？” “窟窿，”彼德答道。
