secondary theme
二级主题
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The project has been carried out during the 2008-2009 and 2009-2010 school years and was aimed at all teachers open to participating in a creative activity on the theme of water and science with their Primary or early Secondary school classes.
UNESCO: Natural Sciences
应用推荐
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