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History is, in its essentials, the science of change. It knows and it teaches that it is impossible to find two events that are ever exactly alike, because the conditions from which they spring are never identical.
历史本质上是变化的科学。它知道并且教导我们，要找到两个完全相同的事件是不可能的，因为它们产生的条件从来都不相同。