The key to success is persistence and continuous improvement.
A person may cause evil to others not only by his actions but by his inaction, and in either case, he is justly accountable to them for the injury.
I think it's important to have closure in any relationship that ends - from a romantic relationship to a friendship.
理解布莱克-斯科尔斯模型的关键在于认识到它是基于创建无风险对冲的理念。