All men have the stars， but they are not the same things for different people。 For some， who are travelers， the stars are guides。 For others they are no more than little lights in the sky。 For others， who are scholars， they are problems。 For my businessman they were wealth。 But all these stars are silent。 You – you alone – will have the stars as no one else has them.

Life is about taking risks, if you don't take risks you'll never know what you're capable of.

PAC学习框架提供了一种形式化的方法来量化概念类的可学习性。

我不是榜样。我是父亲、丈夫、儿子、朋友。我正努力在这些角色中做到最好。