第二个副本嵌套在元素中，表示收集后的堆。
The second copy, nested within the element, represents the heap after collection.
权限副本表示对资源具有与初始权限相同的访问权。
A copy of a permission represents the same access to resources as the original permission.
权限副本表示对资源具有与初始权限相同的访问权。
A copy of a permission represents the same access to resources as the original permission.
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