When every person gains the unreplaceable function,that is to say,specificalization,the humankind will become the more and more perfect.
当每一个人都具有别人不可替代的功能即特定化时 ,人类将越来越完善。
The specialization of animal and the unspecialization of human make the differences in the evolution of the two.
动物的特定化及人的未特定化决定两者进化的异质性。