国际体系的无政府性质意味着国家必须依靠自助来确保其生存。
The anarchic nature of the international system means that states must rely on self-help to ensure their survival.
The biggest reward is not financial gain, but the ability to impact people's lives in a positive way.
The United States has no permanent enemies, no permanent friends, only permanent interests.
The horror of the Twentieth Century was the size of each new event, and the paucity of its reverberation.
The great challenge of the modern world is to create institutions that are strong enough to govern effectively but also accountable and responsive to the needs of citizens.
