- 問題詳情: FivemillionpeoplevisitGrandCanyonintheUSeveryyear.ForthepurposeofhelpingprotectCanyonforyourfellowvisitorsandfuturegenerations,pleasefollowtheguidelinesbelow.CampingToprotectthepark,campingisallowedonlywithinpermittedcampgrounds.Permits...
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