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你必须对自己的能力有信心,然后足够坚强地坚持到底。
You have to have confidence in your ability, and then be tough enough to follow through.
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.