You are never too old to set another goal or to dream a new dream.
广义相对论在某种意义上就是引力场的理论。
成功投资的关键是坚持到底并避免不必要的风险。
劳动力的培训和提高是提高生产力的有效途径。
I'm not a gambler. I don't believe in luck. I believe in hard work and preparation.
Learning is not a passive process; it involves the active construction of knowledge.