paperback

例句：

1. 1. I bought a paperback of "To Kill a Mockingbird" by Harper Lee for my sister's birthday.
   我为妹妹的生日买了一本海明威的《杀死一只知更鸟》的平装版。
2. 2. The library has a large collection of paperback books on history.
   图书馆有大量关于历史的平装书。
3. 3. She prefers reading paperbacks over hardcovers because they are more affordable.
   她更喜欢读平装书而不是精装书，因为它们更便宜。