比尔盖茨在哈佛大学2007年毕业典礼上的演讲
In line with the promise of this age, I want to exhort each of the graduates here to take on an issue—a complex problem, a deep inequity, and become a specialist on it. If you make it the focus of your career, that would be phenomenal. But you don’t have to do that to make an impact… don’t let complexity stop you. Be activists. Take on big inequities. I feel sure it will be one of the great experiences of your lives.

