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The only source of knowledge is experience.

  • -- Albert Einstein 爱因斯坦

知识的唯一来源是经验。

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The one thing that's absolutely clear is that Karl was not the source for the leak and there's no basis for any additional speculation.

有一件事是绝对清楚的，那就是卡尔并不是泄密的来源，没有任何额外的猜测。

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Achievements, seldom credited to their source, are the result of unspeakable drudgery and worries.

成就，很少归功于他们的来源，是难以形容的苦工和忧虑的结果。

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