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It is not often that nations learn from the past---even rarer that they draw the correct conclusions from it. For the lessons of historical experience, as of personal experience, are contingent. They teach the consequences of certain actions, but they cannot force a recognition of comparable situations.
各国很少能从过去吸取教训，更难得的是能从中得出正确的结论。因为历史经验的教训和个人经验一样，都是偶然的。它们教导某些行为的后果，但不能强迫人们认识到类似的情况。