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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These days, many more people book different elements of their holiday online, maybe choosing a flight separately to their accommodation.

BBC: Concerns over new holiday rights' certificate

"Cinderella" was completely reconsidered each time it was produced, in 1957, 1965, 1997 and now in 2013: Not only songs but characters, scenes, plot elements, book and general direction were continually changed.

WSJ: Cinderella: That Flexible Fairy Tale

At its heart, the book takes the characteristics of elements and maps them to human traits.

FORBES: Bunpei Yorifuji's Quirky Guide To The Periodic Table