the cow turned its head away from his hands.

VOA: special.2010.01.09

As much as I might talk on stage twice a week it turns out that it's really by doing and really by diving in and getting your hands dirty that you really take away the course's lessons.

我一周上两次课,就算说得再多，也不如你们亲自动手,通过真正的深入研究,才能学到知识。

哈佛公开课 - 计算机科学课程节选

Such as washing of hands, coughing into sleeve and throwing away tissues once used.

VOA: standard.2010.04.29