基本解释经济学同根派生 英汉例句This paper analyzes the protection of the optimal patent length from the angle of ecomomics with the help of the length benefit curve and the Nordhaus basic model. 摘要文章从经济学角度出发，通过期限收益曲线模型和诺德豪斯的基本模型，对专利最优保护期限进行了分析；