The book is used as a reference book.
这本书被用来做参考书。
This book is famous as a reference book.
这是一本很有名的参考书。
This book is famous as a reference book.
这本书作为参考书而出名。
This book is well-known as a reference book.
这是一本著名的参考书。
Even now it is still often used as a reference book in medicine.
即便现在，人们还常常将它用作医学参考书。
I should recommend it as a useful reference book.
我愿意推荐它作为一本有用的参考书。
I should recommend it as a useful reference book.
我愿意推荐它作为一本有用的参考书。
应用推荐