渔业中最危险的神话是总会有更多的鱼。

True happiness comes from within, not from external achievements or possessions.

The probability of a response is determined by its reinforcement history.

没有青春的爱情有何滋味？没有爱情的青春有何意义？

最好的科学家是那些永不停止问为什么的人。