心理过程因其目的而存在。
Mental processes exist because they serve a purpose.
解释:屋顶是否有漏洞,下面的人才知道。
有时最难的案子是那些离家最近的。
The great challenge of our time is to build institutions that can manage the complexity of modern societies.
The stock market is filled with individuals who know the price of everything, but the value of nothing.