The concept of probably approximately correct (PAC) learning has been foundational in computational learning theory.

最大的风险是根本不承担任何风险。

The most important thing for an actor is to be honest. If you can fake that, you've got it made.

解释：今天不努力做事，明天就会财货贫乏。过去的时光已经过去了，再也不会回来了。

To live is the rarest thing in the world. Most people exist, that is all.