The beauty of mathematics is that it allows us to see patterns and structures in the world that are not immediately obvious.
The United States is the most powerful country in the world, and it will remain so for the foreseeable future.
丙型肝炎病毒是一个隐藏的敌人,但只要拥有正确的工具和决心,任何隐藏的敌人都能被发现。
故事是我们理解世界的方式。