export let ARTICLE_ROUTES: Routes = [
  {
    path: 'article/:id', component: ArticleComponent,
    children: [
      {path: '', component: ArticleContentComponent, pathMatch: 'full'},
      {path: ':detailId', component: ArticleContentComponent}
    ]
  }
];

<a [routerLink]="[section.id]">{{section.title}}</a>

this.router.navigate([sectionId], { relativeTo: this.route});

this._activatedRoute.params.subscribe(p => this.loadMovie(p["id"]));