她过去习惯于在大庭广众之下发表讲话。

She used to make a speech in public.

《新英汉大辞典》

我讨厌你在大庭广众之下说那样的事。

I hate it if you say such things in public.

youdao

那小孩总是在大庭广众之下大闹一番。

That child always makes a scene in public.

youdao

What was previously taught only subtly and in private will now be taught openly and in public.

新政治学，曾经只能被私下隐秘地教授的东西,如果可以公然在大庭广众之下教授了。

耶鲁公开课 - 政治哲学导论课程节选