世界是一本书，不旅行的人只读了一页。

盈利和环境管理并不相互排斥；它们必须齐头并进。

The rule, or measuring rod, which the behaviorist puts in front of him always is: Can I describe this bit of behavior I see in terms of "stimulus and response"?

统一自然界所有力的挑战是几十年来推动理论物理学发展的动力之一。