dirty列表中的块至少包含有一个废弃节点。

The dirty list contains blocks with at least one obsoleted node.

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所有节点都创建成临时(或轻量级)对象，按要求构造成对这些数组的引用，并在不再需要时废弃。

All nodes are created as transient (or flyweight) objects, constructed on demand as references into these arrays and discarded when they are no longer needed.

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