"I don't think there's a good reason to close schools in Ethiopia right now. There's every reason in every country to wash your hands.

VOA: standard.2009.04.28

I think even if you're in a chair, and you're sitting up straight with good posture, maybe hands on knees.

哪怕只是坐在椅子上，坐直并保持良好姿势，也许双手放在两膝上。

普林斯顿公开课 - 人性课程节选