过去是一个异国；他们在那里做事的方式不同。
The complexity of a learning problem is often determined by the size and structure of the hypothesis space.
No arts; no letters; no society; and which is worst of all, continual fear, and danger of violent death; and the life of man, solitary, poor, nasty, brutish, and short.
I don’t need a plan, I just need a vision.
To be born again, first you must die.