As a rule of thumb, historians say, the results of technological innovation always take longer to reach fruition than early champions of change predict.

 
  • 歷史學(xué)家指出,一般說(shuō)來(lái),實(shí)現技術(shù)革新所需的時(shí)間總是比早期變革者們預言的要長(cháng)些。
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