“柠檬问题”指的是当卖家比买家掌握更多信息时，评估产品质量的困难。

Every breakthrough starts with a question, and every question is a step toward the unknown.

I must study politics and war that my sons may have liberty to study mathematics and philosophy.

True courage is not the absence of fear, but moving forward in the face of fear.

Technology should serve humanity, not the other way around.

他们的服饰不同，他们的行为确是一样的。 

我不是说唱歌手，我是一个天堂的传奇。