éminence grise
noun [ C ] uk/ˈem.ɪ.nɒ̃s ˌɡriːz/ us/ˈem.ɪ.nɑ̃ːs ˌɡriːz/ éminences grises uk/ˈem.ɪ.nɒ̃sˌɡriːz/ us/ˈem.ɪ.nɒ̃sˌɡriːz/ (also grey eminence)
幕后策划;幕后掌握实权的人
someone without an official position who has power or influence over rulers or people who make decisions
Civil servants are the ones who really have the power - they are the éminences grises behind the government ministers. 公务员是真正拥有权力的人——他们是政府大臣的幕后掌权者。