人们在做事时绝不能够拖拉，不能够反复多变，不能够斤斤计较；可是替别人做事时，却特别需要耐得住拖延耽搁，耐得住反复多变，耐得住琐碎烦乱。

For every expert there is an equal and opposite expert, but for every fact there is not necessarily an equal and opposite fact.

The future of coal lies in sustainable and responsible mining practices.

教育者的心必须是一团活生生的火焰，是温暖和光明的源泉。