A recent report from an education policy sector ( center ) at indianauniversity exported ( explored ) the historical rules ( roots ) of the traditional school calendar 从印第安娜大学一个教育政策中心的报道中，解释了传统校历时间的历史根源。
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The reason has more to it . a recent report from an education policy center at indiana university explored the historical roots of the traditional school calendar 原因有很多。近期来自印第安娜大学教育政策中心的报告探讨了这种传统的学校作息安排的历史根源。
