HarmonyOS 鸿蒙Next中appPathStack与discoverPathStack的区别是什么？

在DiscoverView.ets中的代码中，appPathStack与discoverPathStack的区别是什么？是作用范围不一样吗？

jumpDetail(item: LearningResource): void {
  if (this.currentBreakpoint === BreakpointTypeEnum.LG) {
    this.discoverPathStack.pushPathByName(‘DiscoverArticleDetail’,
      new Object({
        articleDetail: item, onDestinationBack: () => {
          this.discoverPathStack.pop();
          return false;
        }
      }));
  } else {
    this.appPathStack.pushPathByName(‘DiscoverArticleDetail’,
      new Object({
        articleDetail: item, onDestinationBack: () => {
          this.appPathStack.pop();
          return false;
        }
      }));
  }
}