The last sentence is crucial: Gordon cuts off IR #3 circa 2005 – that is, 45 years from its onset, but less than half the time allowed for IR #1 and IR #2 to run their respective courses. To take a salient example from the prior industrial revolutions, this is as if the impact of the railroads on the US economy were to be measured as of 1873, 45 years after construction began on America’s first line, the Baltimore &amp;
最后一句至关重要：戈登把3号工业革命于2005年切断了——也就是说自其发明始才存在45年，比第一和第二次工业革命得以运行的时间的一半还要短。从之前的工业革命找一个显著的例子，这就好比在1873年衡量铁路对美国经济的影响——也就是美国开始在巴尔的摩和俄亥俄州建设第一条铁路的45年之后就衡量其对经济的影响。