If those dark matter particles are moving really fast, then the gravity in small clumps is not strong enough to slow those fast particles down.

如果那些暗物质粒子移动得非常快，那么小团块中的引力就不足以使那些快速粒子减速。

The reason a stove burns you, is that the fast moving particles of the burner make the particles in your hand move so fast that they tear apart your cells and tissues.

炉子烧伤你的原因是，燃烧器快速移动的颗粒使你手中的颗粒移动得如此之快， 以至于它们会撕裂你的细胞和组织。