求翻译：这是一个为图书作者服务的电子图书查询服务网站。图书作者可以自由的将电子图书上传。并且可以在这个网站上查询自己的图书如何制作成电子图书，这个网站有详细的教程教授图书作者如何自己进行电子图书的制作。最主要的是它是免费的。是什么意思？

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This is one the electronic books inquiry service website which serves for the books author.The books author may free electronic books uploading.How and can inquire own books in this website to manufacture the electronic books, how does this website have detailed course professor books author own to

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