单词：cubical ellipse
椭圆挠线,三次椭圆
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This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute Happy New Year! And dont feel bad about taking today off. After all, youve traveled far. And Im not talking about the trip home from the party last night. According to N
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Tonight the moon looks bigger and brighter than usual. It is a Super Moon. Actually it is a full moon but also a perigree moon when it is the closest to the Earth during its orbit. These two events are happening together tonight. It last happened Mar
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