But they can never engage in those efforts, if we do not do the job that I am confident we will do tomorrow morning at 7:00 AM on Christmas Eve, and that is to renew the American dream, and revive our middle class, and rebuild the foundation upon which future generations will stand.

VOA: standard.2009.12.24

There will in fact never be a good time to try something new, and there will actually never be a semester where you do have that more time.

实际上我已经没有机会尝试新事物了，而且也不用过学期了,但你们有更多的时间。

哈佛公开课 - 计算机科学课程节选

There will in fact never be a good time to try something new, and there will actually never be a semester where you do have that more time.

实际上我已经没有机会尝试新事物了，而且也不用过学期了,但你们有更多的时间。

哈佛公开课 - 计算机科学课程节选