So if you haven't already, just glance at the person next to you, or say hello if you don't know them.

如果你还没有做好，那就看看你旁边的人,如果你不认识他们就跟他们打个招呼。

哈佛公开课 - 计算机科学课程节选

Of course, we haven't yet asked ourselves, how should you live ? if you recognize and take into account those facts?

当然，我们还没有问自己，你该怎样活着,如果你认识到了并考虑了这些事实？

耶鲁公开课 - 死亡课程节选