The pinwheel is an emergent property of the interactions between puppies whose only rule is to try to keep access to the milk and therefore to push in a random direction.
风车式的运动是一个新出现的特征， 它源于小狗们之间的相互作用 小狗们唯一的规则就是要尽量够得着牛奶 因此它们就向一个随机的方向推。