在生物圈的地质历史演化中，智慧圈是众多阶段的最后一个阶段。

I think it's important to have a sense of humor about yourself.

There is no perfection only life.

You have to fight to reach your dream. You have to sacrifice and work hard for it.

The most dangerous phrase in business is 'We've always done it this way.'

The coal industry is about people, not just profits.

科学更多的是一种思维方式，而不是知识体系。