小规模养殖户是这个行业的支柱，他们的知识是无价的。
Small-scale farmers are the backbone of this industry; their knowledge is invaluable.
"Identity is not fixed; it is fluid and constantly evolving."
地球是广阔宇宙舞台上一个非常小的舞台。
The opening up of new markets, foreign or domestic, and the organizational development from the craft shop and factory to such concerns as U.S. Steel illustrate the same process of industrial mutation—if I may use that biological term—that incessantly revolutionizes the economic structure from within, incessantly destroying the old one, incessantly creating a new one.