把这一句，留给此刻的你

It is clear to all that the animal organism is a highly complex system consisting of an almost infinite series of parts connected both with one another and, as a total complex, with the surrounding world, with which it is in a state of equilibrium.

所有人都清楚，动物有机体是一个高度复杂的系统，由几乎无穷无尽的部分组成，这些部分彼此相连，而且作为一个整体，它们与周围的世界相连，处于平衡状态。

— Ivan Petrovich Pavlov 巴甫洛夫