保持利润的唯一方法就是压低工资。
拯救犀牛的唯一方法是拯救它所生活的环境，因为它与数百万其他动植物物种之间存在相互依赖关系。
The materials we choose today become the legacy we leave tomorrow.
地理学是关于地方的科学，而不是关于人的科学。
Optimism is a strategy for making a better future. Because unless you believe that the future can be better, you are unlikely to step up and take responsibility for making it so.
We are all shaped by forces beyond our control.
Psychology is a science, and teaching is an art; and sciences never generate arts directly out of themselves.
Success comes from focusing on what you can control and letting go of what you cannot.
