几乎找不到一个能干的工人，他不会花大量时间研究自己可以工作得多慢，同时还能让雇主相信他工作得不错。

The coal industry must evolve with technology to meet global energy demands sustainably.

"You have to be willing to take risks to achieve great things."

Never let your sense of morals prevent you from doing what is right.

I don't have any particular recipe [for developing new proofs] ... It is the reason why doing research is challenging as well as attractive. It's like being lost in a jungle and trying to use all the knowledge that you can gather to come up with some new tricks, and with some luck you might find a way out.

选自汉·桓宽《盐铁论·申韩》。从事治学的人，需要广泛的阅读，并且需要从中吸取正确、有用的内容。