美国加利福尼亚大学的学者曾做过这样一个实验:把六只猴子分别关在三间空房子里,每间两只。房子里分别放着一定的食物,但放的位置高度不一样。第一间房子里的食物就放在地上;第二间房子的食物悬挂在屋顶;第三间房子的食物则分别从易到难挂在不同高度的位置上。几天后,打开房间发现,六只猴子的生存状况迥异:第一间房子里的两只猴子一死一伤:第二间房子里的两只猴子全死了:唯独第三间房子里的猴子安然无恙。 A scholar from the University of California, USA, has done such an experiment: The six monkeys were kept in three empty houses, two each. There is a certain amount of food in the house, but the location is different. The food in the first house is on the ground; the food in the second house is hung on the roof; the food in the third house is from easy to difficult to hang at different heights. A few days later, opened the room and found that the six monkeys had different living conditions: two monkeys in the first house died and were injured: two monkeys in the second house died: only in the third house. The monkey is safe and sound.