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UNICEF works in more than 190 countries and territories to reach the most disadvantaged childre……

ScienceChina建立于2002年，是中国科学院知识创新工程——国家科学数字图书馆资助项目之一。她集成了中国科学院文献情报机构所创建的、具有一定影响力的中国科学引文数据库、现期目次数据……

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ETS is committed to advancing quality and equity in education for all people worldwide through ……