To light a candle is to cast a shadow.

The computer is incredibly fast, accurate, and stupid. Man is unbelievably slow, inaccurate, and brilliant. Together they are powerful beyond imagination.

教师在学校里不是为了强加某些观念或形成某些习惯，而是作为社区的一员，选择影响孩子的因素，并帮助他适当地回应这些影响。

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。