The essence of mathematics lies in its freedom.

我一直是个斗士。我总是不得不为想要的东西而奋斗。

And that's a lot of the reason why we care so much about our careers and indeed start caring so much about material goods. You know, we're often told that we live in very materialistic times, that we're all greedy people. I don't think we are particularly materialistic. I think we live in a society which has simply pegged certain emotional rewards to the acquisition of material goods. It's not the material goods we want;

The world needs all forms of energy to meet growing demand, and natural gas is a cleaner alternative that can help bridge the gap.

对认可的渴望是人类的基本需求。