一个条目树是一个重量级的对象，需要花时间去构建，并且它是一个您必须使用xml解析器才能解析的结构。

An item tree is a heavyweight object that takes time to build, and it is a structure you have to use an XML parser on.

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尽管第一个长出木本的植物体积很小，但接下来的其他植物种群便能够因此迅速从木本结构优势种获利，仅仅几百万年的时间，其中一些具有木本的植物便进化得像现在的树一样了。

Although the first plants sporting wood were small, subsequent species quickly took advantage of wood's structural strength: in just a few million years, some had attained treelike stature.

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这种在解析期间修改文档结构的做法可以使 DOM 树占用更少的内存，而且还可以减少在内存中遍历和修改文档时所花的时间。

Such modifications of the document structure during parsing can result in a smaller memory footprint for the DOM tree, and also reduce the time spent traversing a document and modifying it in memory.

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