經(jīng)濟(jì)史和經(jīng)濟(jì)發(fā)展的核心問題是解釋政治和經(jīng)濟(jì)制度的演變，這些制度創(chuàng)造了一個誘導(dǎo)生產(chǎn)率提高的經(jīng)濟(jì)環(huán)境。
I've learned that you can't control everything, and sometimes you just have to let go.
The future of mining lies in intelligent and green technologies.