And he offers this advice once you have chosen the record you want to set: Train hard.Plan ahead.Be patient -- don't give up.

VOA: special.2011.05.16

n l m s Once we have chosen a certain mix of n, l, m and s, it is used once for that particular atom.

一旦我们选定了一组量子数，它就只能被一个固定原子所有。

麻省理工公开课 - 固态化学导论课程节选

So Christine is correct in saying that once we delete the strategies 1 and 10 once we realize that those positions are not going to be chosen by our sophisticated candidates then we realize that probably choosing 2 isn't a good idea either.

克里斯汀说的很对,一旦我们剔除了策略1和10,一旦我们意识到,不会有人选择这些立场时,我们会发现,选立场2或9可能也不是个好主意了

耶鲁公开课 - 博弈论课程节选