教授收了四个学生，他们分别来自美国、中国、俄罗斯和日本。开学第一天，教授让他们解决一个问题:桌上有一只烧杯，杯内盛有水，比水面低一点的杯壁上有一个小孔，水从孔里不断流出来。现在要解决的问题是迅速采取办法制止杯中的水向外流。教授给了四位学生一天的思考时间，第 The professor received four students from the United States, China, Russia, and Japan. On the first day of school, the professor asked them to solve a problem: There was a beaker on the table, and there was water in the cup. There was a hole in the wall of the cup lower than the water surface, and the water continued to flow out of the hole. The problem to be solved now is to quickly take measures to prevent the water in the cup from flowing outward. The professor gave the four students a day’s thinking time.