That's why in the earlier models of the atom, they're not horrible to sometimes think about just each n value as a little ring around.

这就是为什么在早期原子模型中，人们没有感觉到把每一个，n，都想象成,一个绕核的小圆圈有什么不妥。

麻省理工公开课 - 化学原理课程节选

We broke up into groups, and each group designed its own toy and made an alpha prototype.

我们分成几个小组，每一组独立设计，并制作出一个玩具模型。

气泡项目 - SpeakingMax英语口语达人