- 问题详情:December21,2012marksthecompletionofthe5,125yearGreatCycleoftheAncientMayaLongCountCalendar.Ratherthanbeinganend-point,thiscyclethatisclosingisnaturallyIfollowedbythestartofanewcycle.Whatthisnewcyclehasinstoreforhumanityisamysterythathasyettoun...
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