（2002-61） 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.
难题之一在于所谓的行为科学几乎全都依然从心态、情感、性格特征、人性等方面去寻找行为的根源。
2
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.
难题之一在于所谓的行为科学几乎全都依然从心态、情感、性格特征、人性等方面去寻找行为的根源。
3
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.