Do they not like the book cover?

还是不喜欢书的封面设计？

Her name is on the book cover.

封面上还有她的名字。

I'll throw in a book cover.

我会附赠一个书套。

What did you learn from book cover?

从书的封面你可以了解到什么？

The book cover is red.

书的封面是红色的。