The anarchic nature of the international system means that states must rely on self-help to ensure their survival.
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。
"In every war, there are two truths: the truth of the victors and the truth of the vanquished."
The world needs reliable energy, and coal still plays a critical role in providing it.
心理生活是一个整体，这一普遍陈述可以毫不犹豫地接受。
如果我们想要清洁的空气和水，就必须从保护森林开始。
"The role of a leader is to create an environment where people can do their best work."
我们开采的岩石讲述着地球的故事；我们只是这份遗产的临时保管者。