每个回声都包含着它所处空间的历史。

成功不在于技术本身，而在于它所带来的体验和改善的生活。

In the end, all we have are words.

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.

The only person you are destined to become is the person you decide to be.