Better understanding of the supply systems in the countries studied and of the pattern of demand for medicines is needed before improvements can be made.
有必要更好地研究这些国家的药物供应体系和药物需求类型，这样才能改善药物的供应。
Better understanding of the supply systems in the countries studied and of the pattern of demand for medicines is needed before improvements can be made.
有必要更好地研究这些国家的药物供应体系和药物需求类型，这样才能改善药物的供应。
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