When it gets to thousands of atoms things start to condense because there is a capacity to form other bonds secondarily, which we will get to in a little bit.

当有成千上万的原子,开始浓缩,因为形成次级键,的趋势，然后得到的体积只有一点点。

麻省理工公开课 - 固态化学导论课程节选