(informal)be very beneficial to someone or something
(非正式)对（人，物）大有好处
under the control of
在…的控制下，受…支配
(Brit.)said to encourage someone or express approval of their actions
(英)（表示鼓励、赞同）祝一帆风顺！祝你成功！
a person who exerts authority or influence without having formal status
幕后操纵者，垂帘听政者
the authorities
当权者
Those who hold effective power in a system or situation
掌权者：在某一系统或职位中掌握实权的人
a plan vetoed by the powers that be.
被掌权者们否决了的计划