It's based on the presumption, the observation even, that all important technologies go through four stages in their life -- at least one of the four stages, sometimes all four of the stages.
它是基于假定甚至观察。 那就是： 所有的重要技术都经历过四个阶段-- 至少四个中的一个阶段，有时是所有四个阶段。