Sustainability isn't just an option; it's our responsibility to future generations.
可持续性不仅仅是一个选择；这是我们对后代的责任。
Life is short, but if we live it right, once is enough.
And your friends will be properly astonished to see you laughing as you look up at the sky! Then you will say to them, "Yes, the stars always make me laugh!"
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。