These are the planks of his model, that matter is composed of atoms that are indivisible and indestructible.

这些是，他的模型的一些内容，物质是有原子组成的,不可分割且不可毁灭的。

麻省理工公开课 - 固态化学导论课程节选

So, someone says I didn't understand what he was talking about at the end of the last lecture when he was doing the Bohr model.

所以，有人会说，我不理解老师,在上节课末尾说的内容,当他在做玻尔模型的时候。

麻省理工公开课 - 固态化学导论课程节选