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的，就新月一样，那么您想象两个相邻的粒子紧密地相互渗透或紧密地相互配合。