布莱克-斯科尔斯公式的美妙之处在于它仅依赖于一个不可观测的参数,即股票的波动率。
贪心不足蛇吞象,知足才能心安。  
The art of the novel is to create a world that is more real than reality itself.
If you're trying to create a company, it's like baking a cake. You have to have all the ingredients in the right proportion.
Success is not final, failure is not fatal: It is the courage to continue that counts.