问如何降低颤振中BannerAd的AdMob高度？

EN

  BannerAd myBanner = BannerAd(
      // Replace the testAdUnitId with an ad unit id from the AdMob dash.
      // https://developers.google.com/admob/android/test-ads
      // https://developers.google.com/admob/ios/test-ads
      adUnitId: BannerAd.testAdUnitId,
      size: AdSize.banner,
      targetingInfo: targetingInfo,
      listener: (MobileAdEvent event) {
        print("BannerAd event is $event");
      },
    );