States are rational actors that seek to maximize their power and security in an anarchic international system.

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。

Innovation in agriculture isn't just about technology; it's about understanding the land and the people who work it.

If you repeated what you did today 365 more times will you be where you want to be next year？