第二次世界大战期间,美国军方招募了一批人上前线打仗,但这些人纪律散漫且不听指挥,于是当局请来心理学家帮助管理这些人。心理学家要求这些人每个月都给家人写一封信,信的内容由心理学家拟好,告诉亲人他们在前线如何勇敢,如何听指挥和立战功等。半年之后,这些人竞都变了样,变得像信中所说的那样勇敢和守纪律。是什么力量使他们变“好”了呢?原来,这种变好的魔力是来自信的内容。这种“魔力”其实有两个方向:一个像刚才讲的那样,可以 During the Second World War, the U.S. military recruited a group of people to fight on the front line. However, due to their discipline and lack of command, the authorities invited psychologists to help manage these people. Psychologists require these people to write a letter to their families every month, the contents of the letter proposed by psychologists, tell their loved ones how brave they are in the front line, how to listen to command and meritorious service. Six months later, these people have become competitive and become brave and disciplined as the letter says. What forces make them “good”? It turned out that this magic is to change the content from the letter. This “magic ” actually has two directions: one as just mentioned, you can