Nativescript + Angular，如何到达嵌套页面路由器插座中的子路由？

import { NgModule } from "@angular/core";
import { NativeScriptRouterModule } from "nativescript-angular/router";
import { Routes } from "@angular/router";

const routes: Routes = [
    {
        path: "",
        redirectTo: "/parent",
        pathMatch: "full"
    },
    {
        path: "parent",
        loadChildren: () => import("./parent/parent.module").then(m => m.ParentModule)
    }
];

@NgModule({
    imports: [NativeScriptRouterModule.forRoot(routes)],
    exports: [NativeScriptRouterModule]
})
export class AppRoutingModule { }

import { NgModule } from "@angular/core";
import { NativeScriptRouterModule } from "nativescript-angular/router";
import import { Routes } from "@angular/router";

import { ChildComponent } from "./child/child.component";

const routes: Routes = [
    {
        path: "",
        component: ChildComponent
    }
];

@NgModule({
    imports: [NativeScriptRouterModule.forChild(routes)],
    exports: [NativeScriptRouterModule]
})
export class ParentRoutingModule { }

<GridLayout>
    <router-outlet></router-outlet>
</GridLayout>

import { NgModule } from "@angular/core";
import { NativeScriptRouterModule } from "nativescript-angular/router";
import { Routes } from "@angular/router";

import { SubChildComponent } from "./sub-child/sub-child.component";

const routes: Routes = [
    {
        path: "",
        component: SubChildComponent
    }
];

@NgModule({
    imports: [NativeScriptRouterModule.forChild(routes)],
    exports: [NativeScriptRouterModule]
})
export class ChildRoutingModule { }