無法提升網域 (或樹系) 的功能層級到要求的數值，因為一或多個網域仍然處於混和的網域模式。所有在樹系中的網域必須是在原始模式，您才能提升樹系的功能層級。

The forest functional level cannot be raised to the requested value since one or more domains are still in mixed domain mode. All domains in the forest must be in native mode, for you to raise the forest functional level.