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导读：The typical pre-industrial family not only had a good many children, but numerous other dependents as well---grandparents, uncles, aunts and cousions. Such extended families were suited for survival in slow paced J)agricultural societies. But such families are hard to A)transplant. They are immobile.(The typical pre-industrial family=extended family)，第一段说明工业化前的大家庭模式的特点：很难流动。) Industrialism demanded masses of workers ready and able to move off the land in pursuit of jobs, and to move again whenever necessary. Thus the extended family C)gradually shed its excess weight and the so-called nuclear family emerged---a stripped-down, portable family unit O)consisting only of parents and a small set of children. This new style family, far more H)mobile than the traditional extended family, became the standard model in all the industrial counties. Super-industrialism, however, the next stage of eco-technological development, M)requires even higher mobility. Thus we may expect many among the people of the future to carry the streamlinling process, a stePfurther by remaining children, cutting the family down to its more E)elemental components, aman and a woman. Two people, perhaps with matched careers, will prove more efficient at navigating through education and social status, through job changes and geographic relocations, than teh ordinarily child-cluttered family.(第二段与第一段形成对比，说明industrialism工业化要求家庭必须流动，导致大家庭变得越来越小，甚至只剩下最基本的成员：男人和女人。) | 
