PAC学习框架提供了一种形式化的方法来量化概念类的可学习性。

If you are ready to give up everything else and study the whole history and background of the market and all the principal companies whose stocks are on the board as carefully as a medical student studies anatomy—if you can do all that and in addition you have the cool nerves of a gambler, the sixth sense of a clairvoyant and the courage of a lion, you have a ghost of a chance.

当当地渔业蓬勃发展时，沿海文化才能延续。

技术是工具，人才是核心。