In the context of computational learning, the concept of 'probably approximately correct' (PAC) learning provides a framework for understanding the efficiency and feasibility of learning algorithms.

释义：世间不存在永远轻松顺遂的处境，也没有无法逾越的艰难困境。人生在世，自始至终都有令人快乐的事，也总有让人忧虑的事。要用平和、辩证的心态看待生活，不因一时的困难而气馁，也不因一时的安逸而懈怠。

论证是一种颓废的意志

Optimism is not just a trait; it's a skill that can be cultivated.

我不是一个放弃梦想的人。

"Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful."

Then I had religion, then I had a vision. I could not turn from their revel in derision. Then I saw the Congo creeping through the black, cutting through the forest with a golden track。