The real value of an option is not in its price, but in the flexibility it provides to the holder.
期权的真正价值不在于其价格,而在于它为持有者提供的灵活性。
量子密码学不依赖于数学问题的难度,而是依赖于物理学的基本定律。
It seems to me that if you or I must choose between two courses of thought or action, we should remember our dying and try so to live that our death brings no pleasure to the world.