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求翻译,在线等,不要用百度翻译来回答

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求翻译,在线等,不要用百度翻译来回答
Over time,the nature of the united states pharmacopeia changed from being a compendium of recipes to a compendium of documentary standards that increasingly are allied with reference materials,which together establish the identity of an article through tests for strength,quality,and purity.
随着时间的推移,美国药典的本质改变从一个纲要的食谱的纲要纪录片标准越来越多参考资料的盟友,共同建立的身份一篇文章通过测试强度、质量和纯度。