calibre-ebook是一个电子书阅读工具，其官网地址为：https://calibre-
calibre is a powerful and easy to use e-book manager. Users say it’s outstanding and a must-have. It’ll allow you to do nearly everything and it takes things a step beyond normal e-book software. It’s also completely free and open source and great for both casual users and computer experts.
下载后导入文件即可使用
