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。
Technological leadership is the foundation of petrochemical enterprises, and we must continuously increase R&D investment.
Leadership means making tough decisions today that will benefit everyone tomorrow.
The great powers are always searching for opportunities to gain power at the expense of their rivals, which makes them inherently aggressive.
画作的表面是一个战场，所有绘画的问题都在这里解决。