History taught us is that people never know learn the lessons of history.
儿童对活动的需要几乎比食物的需要更为强烈。
We must balance the need for energy today with the imperative of protecting the planet for tomorrow.
过去是一位老师,如果我们愿意学习的话。
Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.