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. 摘要文章從經濟學角度出發，通過期限收益曲線模型和諾德豪斯的基本模型，對專利最優保護期限進行了分析； 返回 ecomomics