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Wheat stalks heavy with grain learn how to bow their heads.

麦秆上堆满了谷物，学习如何低头。

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Adaptation

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For the source of any characteristic so widespread and uniform as this adaptation to environment we must go back to the very beginning of the human race.

要找到象这种对环境的适应这样广泛而一致的特征的根源，我们必须追溯到人类的起源。

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People seem to get used to anything, and it is a short step from adaptation to attachment.

人们似乎已经习惯了一切，从适应到依恋是一个很短的过程。

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