earth moon day movement demonstration model student technology small invention diy toy teaching model simple three-ball instrument 地月日运动演示模型学生科技小发明DIY玩具教学模型简易三球仪

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Lunar-Earth-Sun Motion Demonstration Model: A Student-Friendly DIY Toy for Teaching the Simple Terrestrial Tri-Cone Model

Update time：20220914001114

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earth moon day movement demonstration model student technology small invention diy toy teaching model simple three-ball instrument 地月日运动演示模型 学生科技小发明DIY玩具教学模型简易三球仪

earth moon day movement demonstration model student technology small invention diy toy teaching model simple three-ball instrument 地月日运动演示模型学生科技小发明DIY玩具教学模型简易三球仪