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

The British Government will never promise to pay you 10% more each year because they can't do it.

英国政府永远都不会承诺给你们,每年支付你们高于10%的利息,因为他们根本就做不到

耶鲁公开课 - 金融市场课程节选