The creation of one virtual resource from one or more physical resource.
由一个或多个物理资源创建一个虚拟资源。
OpenWhen overridden in a derived class, returns a read-only stream to the virtual resource.
在派生类中重写时，返回到虚拟资源的只读流。
OpenWhen overridden in a derived class, returns a read-only stream to the virtual resource.
在派生类中重写时，返回到虚拟资源的只读流。
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