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我想我以前从未想过要质疑它，但是即使注册的静态属性只注册了一次，您也可以在控件的每个实例上为属性存储不同的值，这似乎很奇怪。字典中的属性是否实际上存储在另一个字典下，该字典跟踪哪个对象对应于属性的哪个值？