TED演讲之伟大预言 伯特·鲁坦: 预见太空未来(4)
Talk very briefly about innovation cycles, things that grow, have a lot of activity; they die out when they’re replaced by something else. 简短地谈一下发明创造的周期,周期发展时会衍生许多活动,当这些活动被其他活动取代,此周期就灭亡了。 These things tend to happen every 25 years. 40 years long, with an overlap. You can put that statement on all kinds of different...