1. On the ground before you is the pile it held — so much like the piles in the other bags, could they be emptied, that all might be combined and mixed in a single heap and the bags refilled without altering the content of any greatly.
    面前的地上则是袋中所装的那堆东西的--它与其他袋子中所倒出的一堆堆东西几乎一模一样，如果把它们混成一大堆，再重新装回各自的袋中，也不会有多大的不同。

2. Which was greatly enhanced by the invention of printing.
    印刷术的发明又大大提高了知识增长的速度。