“广而告之”的广告都是公益性的。

All the advertisements in Mass Media are of public social benefit.

排卵期是真的被隐藏起来了吗？或者只是没有广而告之？

Is ovulation really hidden, or is it just not advertised?

周磊的作品近乎是一组美女荟萃而成的头像组合，头像画面很像我们通常看到的广告宣传画，所不同的是画面中没有广而告之的产品。

Zhou Lei's work is almost combined by a group of beauty's head portrait which be like the poster often been seen.