The world is full of obvious things which nobody by any chance ever observes.

化学是一门研究物质性质及其变化的科学。

I believe in the long-term growth of the United States.

The ladder of success is best climbed by stepping on the rungs of opportunity.

成功不是幸福的关键。幸福才是成功的关键。如果你热爱你所做的事情，你就会成功。