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孩子们值得拥有挑战他们的书,而不仅仅是娱乐。
光波,无论是以太波还是其他波,在所有情况下都是时间上的周期性过程。
"With a library you are free, not confined by temporary political climates. It is the most democratic of institutions because no one - but no one at all - can tell you what to read and when and how."