采矿业必须带头展示采掘作业如何与环境管理共存。
The world is full of magical things patiently waiting for our wits to grow sharper.
A mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between proofs and the best mathematician can notice analogies between theories.
La identidad no es un punto de partida, sino un resultado.
The beauty of instrumental variables is that they allow us to see the world in a new light.
自然是最伟大的艺术家。
