Papers school student management system for background information on the basic tenets of systems development, structure, methods and processes.
论文以学校学生的管理系统为背景，论述了信息系统开发的基本原理，结构，方法和过程。
The papers summarize essential background information on the respective diseases and vaccines, and conclude with the current WHO position concerning their use in the global context.
这些文件归纳了相应疾病和疫苗的基本背景信息，并就其在全球范围内的使用问题最后提出世卫组织的目前立场。
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