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今日長難句
The role of natural selection in evolution was formulated only a little more than a hundred years ago, and the selective role of the environment in shaping and maintaining the behavior of the individual is only beginning to be recognized and studied.
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詞彙解析
evolution 進化;演進
formulate 確切闡述;制定
a little more than 稍多於
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結構分析
主幹1:The role of natural selection in evolution was formulated(被動語態)
主幹2:The selective role is only beginning to be recognized and studied(主謂賓)
注意:兩個主幹圍繞 “環境對人的作用” 展開，前句一般過去時，後句現在進行時，形成昔今 對比，構成遞進關係，其中 only、a little 均強調時間的“近”，強調研究尚不成熟。
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參考譯文
The roleof natural selection in evolutionwas formulatedonly a little more than a hundred years ago,and the selective roleof the environmentin shaping and maintaining the behavior of the individualis only beginning to be recognized and studied.
自然選擇在人類進化中的作用，僅僅在100多年前，才得以闡明。
環境在塑造和維持個體行為方面的選擇作用，現在才剛剛開始得以認識和研究。
