一位挑水夫,有两个水桶,分别吊在扁担的两头,其中一个桶子有裂缝,另一个则完好无缺.在每趟长途的挑运之后,完好无缺的桶子,总是能将满满一桶水从溪边送到主人家中,但是有裂缝的桶子到达主人家时,却剩下半桶水. A water picker has two buckets, each of which is hung on two ends of a pole. One of the buckets has a crack and the other is intact. After every long distance picking, the intact bucket can always be full. A full bucket of water was sent from the stream to the owner’s home, but when the cracked bucket reached the owner’s house, half a bucket of water remained.