蒸汽机是改善人类状况的最有力工具。

I think that in mathematics, and maybe in life, you have to be willing to be a little bit lost.

"Positive psychology is not about ignoring the negative, but about building the positive."

"We are all, in some way, prisoners of our time."

The night is dark, and I am far from home.

个人行为并非为了最大化独立存在的效用函数。

We cannot choose our fate, but we can choose how to face it.

I don’t like to be afraid. I like to be fearless.

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