笔者的一位外国朋友有一次去旁听一位美国加州大学著名的生物学教授的演讲,他看到了这样的一幕:这位教授正在提出他做的老鼠实验的结果,此时有一位学生突然举手发问,提出了他的看法,并问这位教授假如用另一种办法来做,实验结果将会如何?所有的听众全都看着这位教授,等着看他如何回答这个他根本就不可能做过的实验。结果这位教授却不慌不忙,直截了当地说:“我没做过这个实验,我不知道。” One of my author’s foreign friends went to attend a lecture by a famous professor of biology at the University of California in the United States. He saw the scene where the professor was presenting the results of his experiment with rats. Suddenly, Asked questions, put forward his opinion, and asked the professor if the alternative to do, the experimental results will be? All the audience all looked at the professor, waiting to see how he answered this he simply does not May have done experiments. As a result, the professor did not hesitate to say: “I did not do this experiment, I do not know.”