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.

本句譯文：

難題之一在于所謂的行為科學(xué)幾乎全都依然從心態(tài)、情感、性格特征、人性等方面去尋找行為的根源。

句子透析：

　　第一、句子可以拆分為兩段：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、句子的結(jié)構(gòu)是：

1)主干結(jié)構(gòu)是表語從句One difficulty is that...

2)almost all of what is

called behavioral science

是表語從句中的主語部分，后面是簡(jiǎn)單的謂語和賓語結(jié)構(gòu)。

今日句子重點(diǎn)詞匯：

continues to trace behavior to繼續(xù)針對(duì)……研究行為

　　behavioral science 行為科學(xué)

　　states of mind 心態(tài)，意識(shí)狀態(tài)

? 　feelings 感情

traits of character 性格特點(diǎn)

今日贈(zèng)言：

不放棄任何一次學(xué)習(xí)進(jìn)步的機(jī)會(huì)

你將最終取得理想的成功！

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