On the other hand, human violence shows evidence of being a learned behavior.

另一方面，有证据显示人类的暴力是一种习得行为。

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It is precisely that learned behavior that serves as the tool for learning.

正是习得的行为作为学习的工具。

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It is precisely that learned behavior that serves as the tool for learning.

正是习得的行为作为学习的工具。

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