To build a list, you simply pass an element to another list.

构建列表时，只是把元素传递给另一个列表。

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Therefore, you must pass it a root element when you create it.

因此，创建 Document时，必须给它传递一个根元素。

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Therefore, you must pass it a root element when you create it.

因此，创建 Document时，必须给它传递一个根元素。

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