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.
The companies that will thrive are those that see conservation as an investment, not a cost.
The only constant is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.
唯一真正的智慧在于知道你一无所知。
The human body is the most complex puzzle, and medicine is our way of solving it.
我不是名人。我是一个传奇。