把这一句，留给此刻的你

Finally, as the digestive canal is a complex system, a series of separate chemical laboratories, I cut the connections between them in order to investigate the course of phenomena in each particular laboratory; thus I resolved the digestive canal into several separate parts.

最后，由于消化道是一个复杂的系统，是一系列独立的化学实验室，我切断了它们之间的联系，以便研究各个实验室现象的过程;于是我把消化道分解成几个独立的部分。

— Ivan Petrovich Pavlov 巴甫洛夫