可能近似正确（PAC）学习的概念在计算学习理论中具有基础性意义。
The concept of probably approximately correct (PAC) learning has been foundational in computational learning theory.
If it doesn't challenge you, it won't change you.
The best advice I ever received was to stay true to myself and never compromise my integrity.
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。
Silence is argument carried out by other means.