解释：时机未到，就不能勉强行事；行事不探求事理，就不可能达到成功。

If everything was perfect, you would never learn and you would never grow.

"Los Angeles is the city of the future—always."

Government, even in its best state, is but a necessary evil; in its worst state, an intolerable one.

勇敢的人可能不会永远活着，但谨慎的人根本活不下去。

The PAC learning framework provides a formal way to analyze the efficiency and effectiveness of learning algorithms.