The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome.

可持续性不是一种选择；它是我们星球未来的必需品。

"I like to explore the boundaries between the visible and the invisible."

地质学的进步因用想象的原因代替真实的原因而大大受阻。

今天所做之事勿候明天，自己所做之事勿候他人。

生活是一种人人须学而无人能教的艺术。