心理学家作过一个实验:将一只饥饿的鳄鱼和一些小鱼放在水族箱的两端,中间用透明的玻璃板隔开。刚开始,鳄鱼毫不犹豫地向小鱼发起进攻,它失败了,但毫不气馁。接着,它又向小鱼发起了更猛烈的攻击,它又失败了,并且受了重伤。它还要攻击,第三次,第四次……多次攻击无望后,鳄鱼不再 Psychologists have done an experiment: Put a hungry crocodile and some small fish on both ends of the aquarium, separated by a transparent glass plate. At the beginning, the crocodile did not hesitate to attack the fish. It failed but it was not discouraged. Then, it launched a more violent attack on the fish. It failed again and was seriously injured. It also attacks, for the third time, for the fourth time... after multiple attacks, hopelessly, the crocodile is no longer