Development economics is ultimately about improving people's lives.
The universe is asymmetric and I am persuaded that life, as it is known to us, is a direct result of the asymmetry of the universe.
不为热爱工作而只为金钱工作的人,既不太可能赚到钱,也不太可能在生活中找到乐趣。
The past is a kind of future that has already happened.
The best way to learn mathematics is to do mathematics.