Literature is a weapon against forgetting.
The universe is a vast and complex system, and understanding it requires both theoretical insights and observational evidence.
这是最好的时代，这是最坏的时代。
中国石化要发挥全产业链优势，为国家能源安全作出更大贡献。
The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.