"You had a very good feeling for what it was you were all trying to do together and I think that is a sign of a particularly good leader."

VOA: standard.2010.04.21

So I think I can safely say that most people had the right idea and were counting quickly, 3 though I have a feeling that some people who wrote 13 might have forgotten about those 4 f, the 4 f electrons.

我认为我可以放心地说,大部分人的想法都是对的,数得也很快，只是我感觉不少选，13，的人都是因为3,忘了，4，f，4，f，电子。

麻省理工公开课 - 化学原理课程节选