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Mathematician finds brilliant solution to 50-year-old Mobius strip puzzle
破解莫比乌斯带完美长度的古老谜题
See craters on the moon for less — $50 saving off these astronomy binoculars in this Prime Day in October deal
我认为Celestron的Skymaster 20x80双筒望远镜是望远镜的绝妙替代品,尤其是在您想摆脱光污染的情况下。在Amazon Prime Big Deals日,他们享受24%的折扣。