译文：假如让青春年华虚度，到年老时只能悔恨不已。赏析：人生短暂，年华易逝，我们要珍惜每天的日子，不要蹉跎岁月。

The language of mathematics is the language of the universe, and by learning it, we can understand the cosmos.

The most dangerous phrase in the language is, "We've always done it this way."

We need to create technologies that enhance our humanity, not diminish it.

领导力不是靠打击别人来实现的——那是攻击，不是领导。

I want to liberate America from fear. I want people to feel free to express themselves.

对于有信仰的人，无需解释。对于没有信仰的人，无法解释。