以下为句子列表：
英文: In this paper the recent research development at home and abroad on the modifications of high denominator materials and its derivates used as RO membranes was reviewed and its study direction was put forward.
中文: 摘要介绍了反渗透膜的高分子材料及其衍生物材料的种类，叙述了改性方法及研究进展，提出了今后的研究方向。
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英文: While Aristotle's middle-classgovernment of ancient Greek city-state derivates from his idealist design of politics, his highly praised concepts of the middle classsuch as reason and mean also serves as a theoretical foil for the establishment of the syst
中文: 摘要亚里士多德构建的古希腊城邦“中产阶级”政体，是依其政治学的理想主义而设计；而其所推崇“中产阶级”的理性、中庸等品性观念，也是为制度安排的一种理论铺垫。
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