The key to understanding the Black-Scholes model is recognizing that it is based on the idea of a risk-neutral world, where investors are indifferent to risk.
理解布莱克-斯科尔斯模型的关键在于认识到它是基于风险中性世界的概念，在这个世界中投资者对风险漠不关心。
战争的权利源于万国法，而万国法建立在全人类同意的基础上。
"Every book is a door to another world, and every reader is a traveler."
Faith has to do with things that are not seen and hope with things that are not at hand.
