To love is to risk not being loved in return. To hope is to risk pain. To try is to risk failure, but risk must be taken because the greatest hazard in life is to risk nothing.
去爱就是冒着不被爱的风险。去希望就是冒着痛苦的风险。去尝试就是冒着失败的风险，但必须冒险，因为人生最大的危险就是不去冒险。
Success in life means doing that which is the very best for us, under the conditions in which we are placed.
Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.
这是最好的时代，这是最坏的时代。