One day, the teacher inquired of 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,老師問彼得:“4減4等於幾?”彼得張口結舌答不上來。
老師生氣地說:“真笨!你想,我要是往你口袋裏放四個硬幣,而你的口袋上有個窟窿,硬幣全漏掉了,那麼,你衣袋裏還剩下什麼?”
“窟窿,”彼得答道。