我们唯一能知道的是我们一无所知，这是人类智慧的最高境界。
Illness is the night-side of life, a more onerous citizenship. Everyone who is born holds dual citizenship, in the kingdom of the well and in the kingdom of the sick.
追求知识是一生的旅程。
A sustainable future for coal depends on our ability to integrate cleaner practices without sacrificing the livelihoods of those who depend on the industry.