However, each coin has two sides, blank spines made it hard for readers to find their...

骑马订是一种较为简单的书籍装订形式。

不说你可能不知道，这校验码可是有一套有趣的计算方法，现在就来看看吧！

那就是ISBN，即书本的“身份证号码”，就像人类一样，有自己的身份证号码。

According to the definition of the WIPO (World Intellectual Property Organization), copyright is a law that...