Lesson 22（美音）: Knowledge and progress 知识和进步

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不知道能不能这样翻译： Then knowledge began to be accumulated according to a systematic plan. 于是，知识便开始按成体系的规划积累起来。

不知道能不能这样翻译： Libraries made education possible, and education in its turn added to libraries: the growth of knowledge followed a kind of compound interest law, which was greatly enhanced by the invention of printing. 藏书使教育成为可能，而教育反过来又丰富了藏书，如此，知识的增长遵循着一种复利规则，印刷术的发明又使该增长速度大大提高了。

与时俱进

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