go-to

go-to ˈgo-to ◙ adj. [only before noun] (NAmE) • used to refer to the person or place that sb goes to for help, advice or information • (指对象)寻求协助的,征询意见的:

»Heˈs the presidentˈs go-to guy on Asian politics.

他是总统的亚洲政治智囊。