translation.en: Now, the eminent model, the long-tail model tells you that small sales of a large number of books, for example, having only a few copies sold can still be a viable model.
translation.zh: 著名的长尾模型 告诉你小额销售 大量的书籍，比如说， 只卖出几本 仍可以是一个活跃的模型。