I mean, it's a pity we can't kill people in experiments deliberately anymore, because we need to see how this works, but I can't do it.

我的意思是,很可惜我们不能在试验中故意杀人,只为了搞清其中的原理,我们不能那么做

耶鲁公开课 - 古希腊历史简介课程节选

The videos, unfortunately, cannot be made available before. We tried.

可惜视频不能提前提供，我们试了。

哈佛公开课 - 幸福课课程节选