Well, the academic literature shows that panel presentations are clearly more effective than single presentations alone.

研究表明，小组演讲显然比单独演讲更有效。

One thing that one of my sources said – and this was largely in thinking about the suicide that had taken place – was that we can't expect a single presentation or a single talk to end all the bullying that's taking place.

我的一位消息人士说的一件事——这主要是在考虑已经发生的自杀事件——是我们不能指望一次演讲或一次谈话就能结束所有正在发生的欺凌行为。