Courage is rightly esteemed the first of human qualities, because it is the quality which guarantees all others.
勇气是人类最重要的一种特质，倘若有了勇气，人类其他的特质自然也就具备了。
社会系统是个人之间以及群体之间关系的系统。
Innovation in mining isn't optional - it's essential for our future.
Your time is limited, don't waste it living someone else's life.
Every explosion is a dialogue with the unknown. 每一次爆炸都是与未知的对话。