布莱克-斯科尔斯模型的美妙之处在于它将期权定价问题简化为几个可观察的变量。
He always fought, that s what I remember. He fought because he knew if he didn t fight, it would make it that much easier not to fight the next time.
翻译:机密的事情不保密,就会招致祸害。