The truth is rarely pure and never simple.
在教育历史中，应该广泛讨论通过独立的性格和判断力造福人类的人物。
How many times must a man look up Before he can see the sky？
The most dangerous phrase in business is 'We've always done it this way.'
To be human is to be incomplete, always searching.
经济景观是一个由不同等级的中心地组成的系统，每个中心地为特定区域服务。