世界是一个舞台，但演员选得很糟糕。
The world is a stage, but the play is badly cast.
To understand the present, we must understand the past.
The computer is the first metamedium, and as such it has degrees of freedom for representation and expression never before encountered.
The way positive reinforcement is carried out is more important than the amount.
写作是为无形之物赋予形状。
"A key insight in computational learning theory is that the complexity of a learning problem is determined by the complexity of the hypothesis space and the amount of data available."