The opposite of a hardcover book would be a " softcover" (softcover) book.

与精相反的是“软”（softcover）。

Softcover books are usually cheaper, lighter, and smaller than hardcover books.

精常比精便宜、轻、小。

Both hardcover and softcover books are divided into two categories or types: fiction and nonfiction.

精和平都分为两类或类型：小说类和非小说类。