求翻译：2009 年秋季至 2010 年春季，陕西省教育厅和西北大学西北社会经济发展研究中心对省内随机抽取的 30 所样本学校的学生进行了跟踪调查，并将调查结果和同期未实施“蛋奶工程”的23个青海学校的学生是什么意思？

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In autumn 2009 to spring 2010, the Shanxi provincial education department and the north-west northwest Community College Center for Economic Development in the province of the random sample of schools in which 30 students in the track will be investigated and the results and have not been implemente

In 2009 the autumn to 2010 the spring, the Shanxi Province education department and the Northwest University northwest social economy R&D center the draw an item at random 30 sample school student has carried on the track investigation to the province in, and the investigation result and the sam

Fall 2009 to spring 2010, Department of education of Shaanxi Province and Northwest socioeconomic development research center at Northwestern University in the province of a random sample of 30 schools students were followed, and results of the investigation and is not implemented in the same period

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