However, if one of the particles, for example, is concave, like a crescent moon, then you can imagine that two adjacent particles could interpenetrate more tightly or fit more snugly with one another.

但是，例如，如果其中一个粒子是凹，一样，那么您可以想象两个相邻粒子可以更紧密地相互渗透或更紧密地相互配合。