这种电子化的趋势会不会扩展到人类所需的所有书籍种类呢？

What about all the genres of books that fill a different human need?

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另一方面，传统书籍种类广泛，而电子书则是资源短缺。

For another, traditional books have a great variety of books while e-books can be lacking.

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参展的英语书籍种类繁多，各出版社都推出了自己的拳头产品，以适应不同读者的需求。

There was a great variety of English reading material on show. Each publishing house promoted a range of competitive products to meet the various needs of different readers.

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