Since the time when human beings were born on this earth, change has been a constant factor in life.

自人类在地球上诞生，变化更替一直是生命中不变的因素。

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The algorithm is optimal within a constant factor.

该算法在常量因子下是最优的。

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The algorithm is optimal within a constant factor.

该算法在常量因子下是最优的。

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