书籍的发行商通常首先发行硬封面版，然后一年后发行平装本。

Publishers first issue a book in hardback and then, a year later, in paperback.

youdao

书籍的发行商通常首先发行硬封面版，然后一年后发行平装本。

Publishers first issue a book in hardback and then, a year later, in paperback.

youdao