Depending on the nature of the change, a smaller or bigger part of the render tree needs to be recalculated.

根据改变的性质，渲染树上或大或小的一部分需要重新计算。

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Reflows sometimes affect only a small part of the render tree, but they can affect a larger portion, or even the whole tree.

重排版有时只影响渲染树的一小部分，但也可以影响很大的一部分，甚至整个渲染树。

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Nodes in the render tree are called frames or boxes in accordance with the CSS model that treats page elements as boxes with padding, margins, borders, and position.

渲染树上的节点称为“框”或者“盒”，符合CSS模型的定义，将页面元素看作一个具有填充、边距、边框和位置的盒。

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