- 问题详情:MillionsofpeoplevisitYosemiteNationalParkeveryyeartoseethetallwaterfallsandmountains.Thesemountainsareasplendidsightwhenviewedfromthevalleyfloor.Lotsofstores,hotels,andrestaurantsareneededtohandlethecrowds.Also,water,roads,andotherservicesyst...
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