疫苗的安全性和有效性是其研发中最重要的标准。
不要为变老而遗憾。这是许多人求之不得的特权。
技术的力量在于它连接人和思想的能力。
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.