由于技术和社会允许采用高度有效和普遍可接受的计划生育方法，因此家庭规模有所减少。
As technology and society permit highly effective and generally acceptable methods of family planning there has been a decline in family size.
如此规模的可用收入的减少对美国家庭是个沉重的打击。
A decrease of this magnitude in available income is a heavy blow.
与此同时，家庭农场的经营规模逐步扩大，家庭农场数量逐步减少。
At the same time, family farms and gradually expand the scale of operation, gradually reduce the number of family farms.
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