理解布莱克-斯科尔斯模型的关键在于认识到它是基于对冲以消除风险的理念。
The human being is a sun; and the senses are his planets.
Climate science is not about belief - it's about evidence and rigorous testing.
The study of mathematics is the indispensable basis for all intellectual and spiritual progress.
"The world is a book, and those who do not travel read only one page."