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Such being the nature of mental life, the business of psychology is primarily to describe in detail the various forms which attention or conation assumes upon the different levels of that life.

由于精神生活的本质如此，心理学的工作主要是详细地描述注意或联想在精神生活的不同层次上所采取的各种形式。

— Samuel Alexander 萨缪尔·亚力山大