过去一年以来，论及这一问题的书和文章大量涌现。
Books and articles on the subject have proliferated over the last year.
是什么导致了早期美国例如电报、蒸汽船和织布机的重大发明的大量涌现？
What accounts for the great outburst of major inventions in early America—breakthroughs such as the telegraph, the steamboat and the weaving machine?
大量的在线讨论区涌现，人们在这里讨论与上网时间过长有关的负面经历。
Scores of online discussion boards have popped up on which people discuss negative experiences tied to too much time on the Web.
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