If you're not stubborn， you'll give up on experiments too soon. And if you're not flexible， you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.

故事有跨越时空连接我们的力量。

向新能源汽车的转变不仅是一种趋势，而且是可持续未来的必要条件。

Every discovery in physics is a step closer to understanding the grand design of the universe.

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.