国家是理性的行为体，它们寻求最大化相对权力，以确保在竞争性的国际体系中生存。
改变是不可避免的，而成长是可选的。
Profit and sustainability are not enemies; they are partners in long-term success.
The world needs reliable energy, and coal still plays a critical role in providing it.
Don't wait until they tell you, you are ready. Show it. Do it.
The child is not a passive recipient of knowledge but an active participant in the learning process.
儿童不是知识的被动接受者，而是学习过程的积极参与者。
没有无聊的主题，只有无聊的作家。