21st century is the knowledge economic time.

21世纪是知识经济的时代。

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The 21st century will be the knowledge economic time, the knowledge economy is changing our social life in every field profoundly.

21世纪是知识经济时代，知识经济正在深刻地改变着社会生活的各个领域。

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During the background of knowledge economic times, people could hardly learn all knowledge and skill only in the youth period and the full-time school.

在知识经济时代的背景下，人们再也无法在青少年时期、在全日制学校里学完他一生中所需的全部知识与技能。

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Stanford University professor of economics Paul Romer, known for his theories about how knowledge and technology affect economic growth, is now thinking about how technology will make the hidden cost of wasted time less hidden.

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