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，，果其中一粒子是凹的，就新月一样，那么您可以想象邻的粒子可以更紧密地互渗透或更紧密地互配合。