The beauty of the Black-Scholes formula is that it depends on only one unobservable parameter, the volatility of the stock.
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。
Be yourself and you can be anything.
词这种文体，应当写得精微美妙，修饰得当。
Success is not accidental. It requires a lot of effort and sweat.