Our frustration is greater when we have much and want more than when we have nothing and want some. We are less dissatisfied when we lack many things than when we seem to lack but one thing.

人工智能的终极目标是服务人类社会，提升人们的生活水平。

有一个快乐的境况出现，但就有一个不快乐的境况相对立；有一处优美的风景出现，但就立即有一处不优美的风景相抵销。