有些人特别善于了解自己的知识极限,因为他们必须这样做。
The best way to predict the future is to create it.
我们不能一直用老方法做事。世界已经改变,我们也必须改变。
Coal mining is a partnership between the earth and human ingenuity.
I don't believe in playing it safe. I believe in taking risks.