第066句：行为科学

One difficulty is that almost all of what is called behavioral science continues to trace behavior to states of mind, feelings, traits of character, human nature, and so on.

译文：

难题之一在于，所谓的行为科学几乎仍然是从心态、情感、性格特征、人性等方面去寻找行为的根源。

点睛：

该句中that引导的是表语从句，其中还包含what引导的主语从句，作表语从句的主语。Trace sth. to...意为“追溯某事物的根源…”。