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。
The international system is inherently competitive, and states are constantly trying to outmaneuver each other.
沉默是一种语言，它比任何话语都更响亮。
The iron rule of nature is: You get what you reward for.If you want ants to come, you put sugar on the floor.