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估计几个关键参数，尤其是波动率。
应对不自由世界的唯一方法是变得如此绝对自由，以至于你的存在本身就是一种反叛。
Leadership in the energy sector means making tough decisions today that will shape a sustainable tomorrow.
The writer is delegated to declare and to celebrate man's proven capacity for greatness of heart and spirit—for gallantry in defeat, for courage, compassion and love. In the endless war against weakness and despair, these are the bright rally flags of hope and of emulation.
The beauty of science is that it allows us to explore the unknown and make discoveries that can change the world.
现在是一个转瞬即逝的时刻，而过去是永恒的。