01
今日長難句
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.
02
詞彙解析
states of mind 心態
trait 特徵
trace A to B 追蹤到 A 的 B
trace n. 痕跡;微量
03
結構分析
主幹：主語difficulty + 系is + 表語從句that...
修飾：介詞短語of what...修飾 all，兩者看作整體 almost all of sth(幾乎所有)
修飾：固定用法 trace A to B(追蹤到 A 的 B)舉例:traced him to an address(追蹤到他的 地址)這裡的介詞to表示結果
04
參考譯文
One difficulty is that almost allof what is called behavioral sciencecontinues to trace behaviorto states of mind, feelings, traits of character, human nature, and so on.
困難之一在於:幾乎所有、所謂的行為科學
一直在追蹤人類行為，比如:心態、情感、性格特徵、人性等方面。
