实现明天理想的唯一障碍是今天的疑虑。
The only limit to our realization of tomorrow is our doubts of today.
柴油发动机是当今已知效率最高的原动机。
写作是唯一一个不赚钱也不会被人嘲笑的职业。
History teaches us that in 100 years from now some of the assumptions you believed will turn out to be wrong. A good question to ask yourself today is “What might I be wrong about?”
死亡是唯一真正严肃的哲学问题。