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

解释：有的东西外表华丽而实质不好，有的东西实质很好而外表并不华丽。

I like to say that I'm not a politician, I'm a citizen who cares deeply about my country.

The purpose of business is not just profit but contributing to society.

一个人最危险的敌人是他自己的口舌。

幸福就是珍惜那些自己觉得幸福的瞬间。

男性和女性在繁殖策略上有所不同，因为他们在整个进化历史中面临着不同的适应性问题。