Living is like tearing through a museum. Not until later do you really start absorbing what you saw, thinking about it, looking it up in a book, and remembering - because you can’t take it in all at once.

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。

真相很少是纯粹的，也从来不是简单的。