That's a quite difficult argument to pin down does it work or does it not work.

这个论证很难确定,是不是说得通。

耶鲁公开课 - 死亡课程节选

So it's quite difficult in the real world for candidates to position themselves.

所以在现实生活中候选人,选择位置是很难的

耶鲁公开课 - 博弈论课程节选

So, if you smile at somebody, and you just hate their guts but you want to smile at them, it's--unless you're quite gifted it's difficult to fake a really good, really happy smile.

所以，你对某人微笑，你很讨厌他们，但你要对他们微笑，除非你很有天赋,很难去假笑，伪装真正的微笑。

耶鲁公开课 - 心理学导论课程节选