book mould

例句：

1. 1.The book mould is used to make books.
   书模用于制作书籍。
2. 2.The book mould has been used for centuries.
   书模已经使用了好几个世纪。
3. 3. The book mould is a valuable tool in the book-making process.
   书模是制书过程中一个宝贵的工具。