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.

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本句译文：

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。

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句子透析：

　　第一、句子可以拆分为两段：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.

 　

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第二、句子的结构是：

1)主干结构是表语从句One difficulty is that...

2)almost all of what is

called behavioral science

是表语从句中的主语部分，后面是简单的谓语和宾语结构。

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今日句子重点词汇：

continues to trace behavior to继续针对……研究行为

　　behavioral science 行为科学

　　states of mind 心态，意识状态

  　feelings 感情

traits of character 性格特点

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今日赠言：

不放弃任何一次学习进步的机会

你将最终取得理想的成功！

Never give up any opportunity of making progress in study,you will eventually succeed.