And I hope you will come back here to Harvard 30 years from now and reflect on what you have done with your talent and your energy. I hope you will judge yourselves not on your professional accomplishments alone, but also on how well you have addressed the world's deepest inequities…on how well you treated people a world away who have nothing in common with you but their humanity.

我喜欢把大自然想象成一个无限的广播站，通过它上帝每小时都在对我们说话，只要我们愿意调谐。

The essence of mathematics lies in its power to reveal patterns and symmetries.

关系型数据库管理方法不仅仅是一种技术；它是一种关于数据的思考方式。