Perception is an active process where the brain constructs meaning from sensory input.

The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.

We believe in ordinary acts of bravery, in the courage that drives one person to stand up for another.

社会结构因此被定义为实际存在的社会关系的总网络。

Man's main task in life is to give birth to himself, to become what he potentially is. The most important product of his effort is his own personality.