世界上最好和最美丽的东西是看不见甚至摸不到的 - 它们必须用心去感受。

The key to happiness is gratitude.

The true delight is in the finding out rather than in the knowing.

古老智慧与现代思想的融合不是碰撞，而是一场舞蹈。

Natural experiments are a powerful tool for understanding causal relationships in the real world.

世界充满痛苦，也充满战胜痛苦。