- 问题详情:Afloodoccurs(发生)whenwateristoomuch.Thiscanhappeninmanyways.Mostcommoniswhenriversrunoutoftheirbanks.Toomuchrain,abrokendam,iceinthemountainschangingintowater,orevenanunfortunatelyplaceddamcanbreakdownariverandsenditspreadingoverthenearbylan...
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