paperback

/ˈpeɪpərˌbæk/

a book with paper covers

中文释义：平装书；简装书

I prefer buying paperbacks because they are lighter and cheaper.

我更喜欢买平装书，因为它们更轻更便宜。

The novel was first published in hardcover, then later as a paperback.

这部小说最初以精装本出版，后来出了平装版。