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教材:“昼夜长短变化的形成”是人教版高中地理新教材第一单元《人类认识的宇宙》第5节的内容。
Textbook: “The formation of the diurnal variation of day and night” is the content of Section 5 of “The Universe of Human Understanding”, the first unit of the PEP textbook of high school geography.