一切东西的真实价格，即对于想要获得它的人来说真正付出的代价，是获得它所付出的辛劳和麻烦。
Anyone who isn't embarrassed of who they were last year probably isn't learning enough.
忽视海洋资源的国家，就是在忽视自己的未来。
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"?
煤炭行业的未来在于清洁化、低碳化、智能化。