That is why we don't worry about the motion of the nucleus 1 because the ratio of mass is about 2,000 to one.

这就解释了为什么我们不担心,原子核运动起来,因为原子核和电子的质量比约为2000：

麻省理工公开课 - 固态化学导论课程节选

Because I thought everyone was going to be around like the 45 range because 66 is two-thirds, or right around of 100, and they were going to go two-thirds less than that and I did one less than that one.

因为我想每个人都会选45左右的数,因为66约等于一百的2/3,而大家会选比那小的,我就选了更小的数

耶鲁公开课 - 博弈论课程节选