It contains a sequence of book elements.

其中包含book元素的序列。

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For each author found, the code then has to search back up the tree for all the book elements with that particular author name embedded in them.

对于发现的每个作者，代码必须接着反过来到树上全面搜索以获取嵌入特定作者姓名的所有书籍元素。

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Unlike every other book, you cannot remove elements of this book.

和其它的书不一样，你不能去除这本书中的任何元素。

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Now if you read in the book, you read about where this figure is shown in the book, you can understand more about why these structures line up in the right way so that the right molecular elements are together to form hydrogen bonding pairs between them.

如果你预习过课本,课本中有关于这些详细的描述,你可以更深刻的理解,为什么这些结构是采用这种连接方式,以使对应的分子部分靠近,并形成氢键连接

耶鲁公开课 - 生物医学工程探索课程节选

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