The stock market is the story of cycles and of the human behavior that is responsible for overreactions in both directions.

深度学习是解决复杂问题的强大工具。

    ——杜先生晚年在香港，先生为中国抗战.赈灾慈善做出巨大贡献，晚年依旧气度过人，毁掉所有欠条。

It is in the thirties that we want friends. In the forties we know they won't save us any more than love did.

计算思维的本质是抽象和自动化。