教育是老年人的最佳粮食。
"The world is a mirror, and the mirror is a shadow."
Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.
The mind is a set of information-processing machines that were designed by natural selection to solve adaptive problems faced by our hunter-gatherer ancestors.
Passionate hatred can give meaning and purpose to an empty life.