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。
教育就是当一个人把在学校所学全部忘光之后剩下的东西。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
儿童教育是人类最重要的一个问题。
Imagination is the key to understanding the world.
最好的肥料?是农民田间的足迹。
The more you're actively and practically engaged, the more successful you will feel.