If power or authority is vested in someone or something, or if someone or something is vested with power or authority, it is officially given to him, her, or it.

"By the power vested in me, I now pronounce you husband and wife." (= said by a minister or official marrying two people) 以法律赋予我的权力，我现在宣布，你们正式结为合法夫妻。

He has been vested with the power/authority to implement whatever changes he sees fit. 他有权实行他认为合适的任何变革。