Nature and history are the two great sources of geographical knowledge.
自然和历史是地理知识的两个重要来源。
积极心理学不是一项观赏性运动。
文学是让不可见的东西变得可见的艺术。
I'm not perfect, I don't claim to be. But I'm trying.
The great and chief end, therefore, of men's uniting into commonwealths, and putting themselves under government, is the preservation of their property.