该属性返回了文档和存在于所有XML和HTML文档内的根节点。
This property returns the root node of the document and exists in all XML and HTML documents.
并进而指出，造成马奈绘画存在该种缺憾的根因包含着主客观两个方面：客观上与19世纪社会转型期艺术被赋予的阶层属性相关联；
The objective reason is related with the nature of the class in which art was placed during the transitional period in the 19~(th) century.
这个属性只会存在于根项目中，尝试在其他位置寻找或设定这个属性将会掷回例外状况。
The property only exists on root elements; attempting to find it or set it elsewhere will cause an exception to be thrown.
这个属性只会存在于根项目中，尝试在其他位置寻找或设定这个属性将会掷回例外状况。
The property only exists on root elements; attempting to find it or set it elsewhere will cause an exception to be thrown.
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