这就是人类第一个划时代的变革,人类建立了家庭,形成了某种形式的私有制,也给自己带来了无穷无尽的争吵和冲突。
Psychology must be grounded in the facts of living experience.
坚持是数学研究的关键,许多伟大的成果来自于长期的奋斗。
"Kindness is a language that everyone understands."
The only way to achieve the impossible is to believe it is possible.