1、他发现了人类行为的一大法则，自己还不知道那就是，为了要使一个大人或小孩极想干某样事情，只需要设法把那件事情弄得不易到手就行了。《汤姆索亚历险记》He found a big rule of human behavior, and he didn't know it - that is, to make an adult or child want to do something, he just needs to try to make it difficult to get it2...
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