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京东 11.11 红包
Explaining Equinoxes by Dr. Rick Knabb (The Weather Channel) 春秋分简介(地球仪和灯泡)
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https://www.youtube.com/watch?v=Sz7OREEO6AY What determines the first days of spring and fall? The equinoxes! Dr. Rick Knabb demonstrates a fun and educational activity you can do with your kids to understand how this works!
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