The person use that book before may write some notes on it, which can help us learn the knowledge in the book well.
之前用那本书的那个人可能会在书中做笔记，这样就可以帮助我们理解书中的知识。
The person use that book before may write some notes on it, which can help us learn the knowledge in the book well.
之前用那本书的那个人可能会在书中做笔记，这样就可以帮助我们理解书中的知识。
应用推荐