Translation of "Abstract" in Chinese

This description is too abstract.

这个描述太抽象了。

I made an abstract of a book.

我為一本書寫了內容提要。

Some abstract art is difficult to understand.

一些抽象藝術是很難理解的。

To him, hunger was an abstract concept; he always had enough to eat.

對他來說，「肚子餓」是個抽象的概念，因為他從來就沒有餓過。