求翻译：摘要：可持续发展经济学是20世纪中叶以来逐渐形成的一门新兴的综合性、应用性很强的经济学科。传统经济学面对资源的稀缺性，研究资源在当代人之间的有效配置问题；而可持续发展经济学是面对资源枯竭性及不可再生性，研究资源的代际有效配置问题。本文从可持续发展经济学思想的历史沿革及不同分类出发，试着探寻可持续发展经济学的理论框架。是什么意思？

Abstract: Sustainable development economics since the mid-20th century, the gradual formation of a new comprehensive, applied a strong economic discipline. The face of conventional economics, scarcity of resources, research resources in the contemporary issues between the effective allocation; and s

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Abstract: Since the sustainable development economic is an emerging comprehensive nature, the utility very strong economical discipline which 20th century middles has formed gradually.Traditional economic facing resources scarcity, research resources between present generation effective disposition

Abstract: sustainable development economics was developed since the middle of the 20th century a new comprehensive and applied a strong economic discipline. Traditional economics facing the scarcity of resources, studies on effective allocation of resources between present; and economics of sustaina

Abstract: Sustainable development economics since the mid-20th century, the gradual formation of a new comprehensive, applied a strong economic discipline. The face of conventional economics, scarcity of resources, research resources in the contemporary issues between the effective allocation; and s