And in 1961, during the Cold War with the Soviet Union, John Kennedy urged people to take an active part in the future: "And so, my fellow Americans, ask not what your country can do for you - ask what you can do for your country.

VOA: special.2009.01.19

Ask not what you can do for your country, etc.

不要问你能为你的国家做些什么这样的问题。

麻省理工公开课 - 固态化学导论课程节选