分级保护 meaning in English

cascade protection

Article 3 the state practises graded protection for those varieties of traditional chinese medicines stable in its quality and effective in its therapeutic results in order to encourage the research and development of new varieties of traditional chinese medicines with clinical effectiveness
第三条国家鼓励研制开发临床有效的中药品种，对质量稳定、疗效确切的中药品种实行分级保护制度。
Based on the analysis of hydrogeological conditions in the study area , calculation and chose of the hydrogeological parameters was performed by ga , and three methods were used to evaluate groundwater resources of yangzhuang karst water system in this paper . calculation and analysis of water resources carrying capacity of yangzhuang basin were set up . as well as suggestions of protection about yangzhuang karst water system was provided clearly
在分析研究羊庄盆地水文地质条件的基础上，应用遗传算法( ga )进行水文地质参数优选，并利用三种方法计算评价了羊庄岩溶水系统的可采资源量，计算分析了羊庄盆地的水资源承载能力，并提出了增源增采及分级保护的措施。