我们必须投资于研究和教育，以确保下一代有能力引领行业向前发展。

我们的矿工是美国最勤劳的人。

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.