In the new situation, the educational science research in primary and secondary schools bears great significance.

新形势下，中小学开展教育科学研究具有重要意义。

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Plans, organises, directs, controls and coordinates the educational and administrative aspects of primary, middle or intermediate and secondary schools including physical and human resources.

校长负责企划、组织、指导、控制和协调小学、中学、高中阶段的教育、行政方面事宜(包括物质人力资源方面)。需要注册或许可证。

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As a result, there has been a heavy reliance and dependence on textbooks to maintain the education system and to provide educational opportunities to primary and secondary schools.

UNESCO: Textbooks Quality Improvement Programme in Iraq | United Nations Educational, Scientific and Cultural Organization

After declining during the 1970s and early 1980s as the last of the baby boomers worked their way through the educational system, total primary and secondary school enrollment in public and private schools in the United States grew steadily during the late 1980s and 1990s, reaching an all-time high of 52.7 million in 1998.

UNESCO: II Part Analytic Section

This network comprises approximately 7, 900 educational institutions in 176 countries (ranging from pre-schools and primary to secondary schools and teacher training institutions).

UNESCO: About Us