相对自由的美国婚姻American Ma~iage with Relative Freedom 家庭结构的演变The Transformation of Family Structure 美国人的住房American Housing ..
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随着社会的老龄化和家庭结构的演变，空巢家庭正迅猛增加。
With the social ageing and the change of family structure, empty nest family is expanding swiftly.
目前对中国北方地区农村家庭能源消费结构演变的研究较少。
There is scarce study on the evolvement of rural household energy consumption structure in Northern China at present.
其演变的基础是农户家庭决策者受教育时间的加长以及家庭经营结构的非农化变迁；
The change base is the more and more lengther learning time of decisionmaker in household and the more and more larger economic structure change in family management of household.
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