Learning could not occur without the function popularly named memory.

没有这种一般被称之为记忆的功能，学习就不可能发生。

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If we could turn the clock back, we would not have let that occur.

如果我们能让时钟倒转，我们不会让它发生。

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If we could turn the clock back, we would not have let that occur.

如果我们能让时钟倒转，我们不会让它发生。

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