要理解心理学，就要在自然环境中观察行为。

You think when you wake up in the mornin yesterday don't count. But yesterday is all that does count.

人们改变了，却忘了告诉对方。

民主城邦的基础是自由权。

We must design products with their end-of-life in mind from the very beginning.

地球是一个动态的行星，其内部热量是地质变化的驱动力。