I mean they take up a teeny bit but essentially when we're thinking about the set up of the atom, we don't have to account for them as using up a lot of the mass we're discussing.

所以我们可以假设电子没有质量,它们占据了，非常小的一部分,所以当我们考虑,原子的构造的时候,不用考虑它们的质量。

麻省理工公开课 - 化学原理课程节选

All right. So most of you got that, though there is this little sub-set we have thinking that we have one, so let's actually write this out here.

好，大部分人都答对了，虽然还,有些人没对，让我们把这个写下来。

麻省理工公开课 - 化学原理课程节选

Perhaps more realistic to think of firms actually thinking about what prices to set and then adjusting the quantities they actually ship based on demand.

设想公司正在考虑,如何设定价格然后根据需求,相应地调整产量

耶鲁公开课 - 博弈论课程节选