Angular 2路由和组件子

Question

例如我们有3个组件：TestComponent，TestChildComponent，TestChildChildComponent

in app.module: { path: 'test' , component: TestListComponent },
               { path: 'test/:id', compomnent: TestChildListComponent },
               { path: 'test/:id/:id, component: TestChildChildListComponent }

它们由[routerLink]链接，一切正常，但我如何添加N子组件？