常见例句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； 返回 ecomomics