当我们将带有路由的导入模块添加到应用程序中时，如果我们尝试在懒加载时使用这些导入的模块，就会出现问题。因此，我们需要创建子路由组并将其添加到懒加载模块中。

例如，考虑以下示例：

在app-routing.module.ts中：

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

const routes: Routes = [
  { path: 'home', loadChildren: () => import('./home/home.module').then(m => m.HomeModule) },
  { path: 'dashboard', loadChildren: () => import('./dashboard/dashboard.module').then(m => m.DashboardModule) },
];

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

在dashboard-routing.module.ts中：

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { DashboardComponent } from './dashboard.component';

const routes: Routes = [
  { 
    path: '', 
    component: DashboardComponent,
    children: [
      { path: 'overview', loadChildren: () => import('./overview/overview.module').then(m => m.OverviewModule) },
      { path: 'details', loadChildren: () => import('./details/details.module').then(m => m.DetailsModule) },
    ]
  }
];

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

在dashboard.module.ts中：

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

import { DashboardRoutingModule } from './dashboard-routing.module';
import { DashboardComponent } from './dashboard.component';

@NgModule({
  declarations: [DashboardComponent],
  imports: [
    CommonModule,
    DashboardRoutingModule
  ]
})
export class DashboardModule { }

在overview-routing.module.ts中：

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { OverviewComponent } from './overview.component';

const routes: Routes = [
  { 
    path: '', 
    component: