节约用水(SavingWater)
Theworldisnotonlyhungry,butalsothirstyforwater.Thismayseemstrangetoyou,sincenearly75%oftheearth'ssurfaceiscoveredwithwater.Butabout97%ofthishugeamountisseawater,orsaltwater.Mancanonlydrinkandusetheother3%--thefreshwaterthatcomesfromrivers,lakes,underground,andothersources.Andwecannotevenuseallofthat,becausesomeofitisintheformoficebergsandglaciers.Evenworse,someofitha***eenpolluted.
However,asthingsstandtoday,thissmallamountoffreshwater,whichisconstantlybeingreplacedbyrainfall,isstillenoughforus.Butourneedforwaterisincreasingrapidly--almostdaybyday.Onlyifwetakestepstodealwiththisproblemnowcanweavoidasevereworldwidewatershortagelateron.Alimitedwatersupplywouldhaveabadeffectonagricultureandindustry.Letmegiveyoujustonesmallexampieofhownecessarywateristoindustry.Didyouknowthattoproduceasingletonofsteel,ittakesabout91,000litersofwater?
Weallhavetolearnhowtostopwastingourpreciouswater.Oneofthefirststepsweshouldtakeistodevelopwaysofreusingit.Experimentshavealreadybeendoneinthisfield,butonlyonasmallscale.Forus,thesystemsareasimportantasthespacecraft.
节约用水的重要性(Importanttosavewater)
Waterisakindofliquid.Ithasnotasteorsmell.Itistransparent,too.Waterisusefulandisimportanttous.Why?Forexample,weusewatertowatertheplants.Weusewatertowashourfaceortohaveabath.Wedrinkwaterorwewilldie…WaterisalsoveryimportantforChina.Thereare2.8hundredmillionsofsteresofwaterinChina,buteveryonecanonlyuse2300steres.Itisonlytwenty–fivepersentintheworld.
Nottoolongago,therewasamancalledJacquesCousteau.Helovedthebeautifulcolors,andthebeautifulfishinthesea.However,whenhereturnedsomeyearslater,thecolorfulcoralreefsweredeadandgreybecausethefactoryneartheseapouredwastewaterintothesea.JacquesCousteaudecidedtotellpeoplehowimportantitwastosavetheenvironmentunderthesea.Hestartedthe“CousteauSociety”tohelpprotectlifeinthesea.Nowthereareover30000membersallovertheworld.Sincewatercoversmostoftheearth,Cousteauknewthatweshouldkeeptheseaclean.Weshouldnotlitterthesea,andshouldcleanupthedirtyparts.Aswaterisveryimportanttoourenvironment,heencouragedeveryonetotakepartinprotectingourlakes,rivers,seaandocean.
Therearestillafewpeoplewhoarenotprotectingthewaternowintheworld.Forexample,somefactoriespourwastethingsintotherivers,lakesorintotheseanearby.Thewaterthereha***ecomeverydirtyandwecan’tusethematall.Althoughthereareseventy–fivepersentofwaterintheworld,wecanonlyusefreshwater,thatthereisonlyalittle.Soweshoulduselittlewaterwhenweneedtouseit.Forexample,IdonotusetoomuchwaterwhenIamwashingmyfaceorhavingabath…Itisimportantforustokeepthewaterclean.Youmayaskyourself,haveIeverpouredorthrowndirtythingsintothewater?Ifyouransweris“No”,thatmeansyouhavealreadyhelpedtoprotecttheenvironment.Itisourdutytoprotecttheenvironment.Youmayaskyourselfagain,haveIeverhelpedtocleanupthewater?Ifyouransweris“Yes”,thatmeansthatyouhavealreadydonesomethingusefultoimprovethewater.Ifweuseupallthewater,itisdifficultforustogetitfromanywhere,includingtheuniverse.Itisterribletothinkthatpeoplearetoothirstytolive!Ibelieve,thatifeveryonehelpstoprotectthewater,thewatermustbeprotected.Youdonotwantto“kill”yoursonoryourgrandson,doyou?Sonowletustoprotectthewater!Pleasedon’tletthelastdropofwaterontheearthiswehuman’stear!