And for Americans, all our democratic experience and do I have to put a tie on for this event or not?

美国人也如此,我们都参与民主政治,知道在什么场合需要系领带,比如现在

耶鲁公开课 - 美国内战与重建课程节选

But one thing we can do is tell you where leadership may help.

可至少能知道它在什么场合有用武之地

耶鲁公开课 - 博弈论课程节选