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。

运营效率和战略都是创造卓越绩效的关键。

The brain is still forming in our 20s, which means it's more open to change.

"Reading is a superpower that every child should have."

市场是所有参与者集体心理的反映。