小李的同事小王电脑中收集有500多本精品PDF电子书，电子书文件名都是书的名字。

Xiao li's colleague wang computer collection of more than 500 high-quality goods PDF ebooks, ebook file names is the name of the book.

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质地优良，层次鲜明深刻，像一层一层叠上去的层书一样，是千层石中的精品。

Fine texture, the level of deep and clear, like a layer of a layer of the same layer of the book, is a thousand stone in the boutique.

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