The render tree has at least one node for every node of the DOM tree that needs to be displayed (hidden DOM elements don't have a corresponding node in the render tree).

渲染树中为每个需要显示的DOM树节点存放至少一个节点（隐藏DOM元素在渲染树中没有对应节点）。

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But it is weathering because of poorly kept and hidden in the tree hole too many years. So it needs the authoritative appraisal and to be kept by professional.

但因保管不力，多年藏于千年古树洞，已现风化，亟需权威专家鉴定，交由专业人员收藏保管。

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