人们总以为淡水是取之不尽的，实际上淡水资源是很有限的。请谈谈你的看法

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Itisgenerallybelievedthatthereisagoodsupplyoffreshwater.Buttoourdisappointment,thefactisjusttheopposite.  

Aswecansee,theworldpopulationisgrowingrapidlydaybyday.Soenoughfreshwaterisneededtofeedsuchabigpopulation.What＇smore,withthedevelopmentofindustry,factoriesandvehiclesproducepoisonousgasesorwastes,whichconsequentlyresultsinthepollutionofwater.Thoughfresh,agoodamountofitcannolongerbeused.Onlyquitelimitedfreshwaterresourceisavailabletohumanbeings.Soit＇shightimeforushumanbeingstotakequickactiontoprotectwaterresource.Stoppollutionandsavewater,otherwise,wecannotsurviveontheearth.  

Withfreshwater,theworldwillbeprosperous.(130words)