book是什么意思

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.
【book是什么意思】3、Could you tell me what is the middle idea of the book?

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