I have shown that by taking Avogadro's number of individual ion pairs and putting them all together in a line, the system's energy became more negative.

我推导出了,从每一个离子对中抽出阿伏加德罗常数,再把它们放在一起在一列中，这个系统的能量就变得更负。

麻省理工公开课 - 固态化学导论课程节选

So this gives you a little bit of an idea of just how many individual photons there are in a laser beam of light. This is a huge number of photons.

这个给你们一点思路关于,一个激光束有多少独立的光子,这是一个巨大的光子数目。

麻省理工公开课 - 化学原理课程节选

I bet there are people in this room who know the lyrics to over 1,000 songs, NBA know the number of every individual in the National Basketball Association, so I think that learning some subset of elements is not unreasonable.

我敢打赌这个房间里有那么些人,他们能记得住超过1000首歌的歌词，记得住,每个人的号码，因此我认为,能记住这些元素也不是不可能的。

麻省理工公开课 - 固态化学导论课程节选