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看不懂题啊??

Posted by arena_zp at 2008-03-23 14:18:00 on Problem 2432 and last updated at 2008-03-23 14:18:31
In order to make sure he actually circles the Earth, he wants to ensure that the clockwise distance he travels is different from the counterclockwise distance he travels.

这句话怎么理解??

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