It's harder than you think, right, but that's the kind of thing that musicians, particularly percussion players, have to be able to execute.

比你想的要困难得多,但这就是音乐家,尤其是打击乐手所必须具备的能力

耶鲁公开课 - 聆听音乐课程节选

It also is a good lesson in how difficult it is, and we'll talk about this in a subsequent class, to actually measure what people eat.

同样这能很好的说明,实际评价人们的饮食有多困难,我们下节课会讨论这个话题

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选