在Angular应用程序的主模块中，您可以通过使用useFactory而不是useClass来设置ngx-translate loader以确保它在应用程序首次启动时能够加载译文。

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpClientModule, HttpClient } from '@angular/common/http';

import { TranslateModule, TranslateLoader, TranslateService } from '@ngx-translate/core';
import { TranslateHttpLoader } from '@ngx-translate/http-loader';

export function HttpLoaderFactory(http: HttpClient) {
  return new TranslateHttpLoader(http, './assets/i18n/', '.json');
}

@NgModule({
  imports: [
    BrowserModule,
    HttpClientModule,
    TranslateModule.forRoot({
      loader: {
        provide: TranslateLoader,
        useFactory: HttpLoaderFactory,
        deps: [HttpClient]
      }
    })
  ],
  exports: [TranslateModule]
})
export class AppModule {
  constructor(translate: TranslateService) {
    translate.setDefaultLang('en');
    translate.use('en');
  }
}