These worlds in space are as countless as all the grains of sand on all the beaches of the earth.

-- Carl Sagan 卡尔·萨根

太空中的这些世界就像地球上所有海滩上的沙粒一样不计其数。

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Grains Countless

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The science of politics is the one science that is deposited by the streams of history, like the grains of gold in the sand of a river; and the knowledge of the past, the record of truths revealed by experience, is eminently practical, as an instrument of action and a power that goes to making the future.

政治学是一门科学，它是由历史的洪流沉淀而成的，就像河沙中的金粒;对过去的认识，对经验所揭示的真理的记录，作为一种行动的工具和创造未来的力量，是非常实用的。

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Even the most wretched individual of our present society could not exist and develop without the cumulative social efforts of countless generations.

没有无数代人的累积社会努力，即使是我们当今社会中最不幸的个人也无法生存和发展。

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As human beings, we are the genetic elite, the sentient, contemplating and innovating sum of countless genetic accidents and transcription errors.

作为人类，我们是基因的精英，是无数基因事故和转录错误的结合体。

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