当你想要放弃的那一刻，想想你为什么坚持了这么久。
It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge.
试图阻止知识前进是没有好处的。无知永远不比知识好。
Success is a journey, not a destination. Keep pushing forward.
If you want to see what this nation is all about, you have to ride the rails. Look outside as you speed through, and you’ll find the true face of America.
Every tree we plant today is a legacy for future generations.
The more you sweat in practice, the less you bleed in battle.