Productive thinking is characterized by the sudden appearance of the solution as an insight.
Life would be infinitely happier if we could only be born at the age of eighty and gradually approach eighteen.   
Life is not a paragraph, and death is no parenthesis.
矿业必须以可持续发展为核心进化,否则我们可能被淘汰。
传统方法蕴含智慧,但可持续发展要求我们在必要时超越它们。