direct link(между чем-то и чем-то: There's a direct link between lack of sleep and the incidence of type 2 diabetes in children, recent research indicates. • I'm going to show you all that there's a direct link between: Bill Clinton, a skunk, a Siberian Husky, Russia and chicken vindaloo.)
direct connection(между чем-то и чем-то: There's a direct connection between the discrimination people of color face in our health-care system and their level of trust in it.)
