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“一位探险家向南走了一英里,然后,折向东走了一段路,再后,又向北走了一英里,结果他回到了原来的出发地, 并遇上了一头大熊。你说,他见到的是头
An explorer walked south for a mile and then headed east for some distance before heading north again for a mile before returning to his place of origin and meeting a big bear. Said he saw the head