book：作名词指书, 书籍, 卷, 篇, 帐簿, 名册, 工作簿；作动词指登记, 预订, 控告。
例句：
1、This is my book.
2、The book is so difficult that I can not understand.
3、Could you tell me what is the middle idea of the book?
book：作名词指书, 书籍, 卷, 篇, 帐簿, 名册, 工作簿；作动词指登记, 预订, 控告。
例句：
1、This is my book.
2、The book is so difficult that I can not understand.
3、Could you tell me what is the middle idea of the book?
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