power vacuum
noun [ C usually singular ] uk/ˈpaʊə ˌvæk.juːm/ us/ˈpaʊ.ɚ ˌvæk.juːm/
权力真空
a condition that exists when someone has lost control of something and no one has replaced them
She was quick to fill the power vacuum that was left by the sudden death of the managing director. 她很快就填补了总经理突然离世留下的权力真空。