Asof2005,Chinaalreadyhas31naturallandscapeandhistoricalsiteshavebeendeclaredasaworldculturalheritage,whenweareimmersedintheworldwithjoyandpridetosharethese,whenalmostnoonestoppedtothinkaboutthoseofusthefutureoftheworld'streasures. 　　Asweknow,thankstoitsvastterritoryofChina,itissuchavastterritorythatshehasmanydifferenttypesofclimaticconditions,onlygavebirthtotherichandcolorfulChineseculture.However,thebenefitswillalsohaveanegativerole,theDunhuangMogaoGrottoesisonesuchexample.Forthousandsofyears,ourforefathersexhaustedtheirlifetimeinthisgreatanddeepcaves,theknowledgeandwisdomwithbrushcondensatecastineachsideofthewall,hopingthatknowledgeandwisdomtobeimmortalized.Atthattime,whohadthoughtthatonedaythesehugeandmagnificentworkswillbedamagetotheforcesofnature.MogaoGrottoesislocatedinChina'snorth-west,toconnecttheEurasiancontinentintheSilkRoadTrail,isalongroadthatthelargesttreasure.Despiteahundredyearsagoithadbeenstolen,butitdamagedthebiggestreasonisthatcontinentalclimatebroughtaboutbythedisaster.MongoliabytheNorthtothehigh-pressureeffectsofclimateDunhuangregionperennialdrought,sandstormsfrequent,annualprecipitationisonlymorethan40millimeters,whiletheannualevaporationisashighasmorethan4.3thousandmillimeters,uptoseveralthousandyearsoftime,ourMogaoGrottoeshasbeenfrequentlyattackedbytheduststorms,coupledwithlong-termdroughts,earthquakesandrainerosionoftheouterwallofacaveonceeroded,constantlythinning.Tomakemattersworse,cavemuralshavebeguntochangecolor,fromA,crispandevenoffbase. 　　Fromthe20thcentury,thebeginningofthe40's,theChinesepeoplebegantohaveaconsciousacttogethertoprotectourgreathistoricaltreasures.First,peoplehavebeenbuiltintheclifffacesandwall,buthavelittleeffect;latertriedtodiganti-Shagou,soontobefilledsand.Inrecentyears,wefinallyfoundthesandandsandcontrolcanbeagoodway.Firstofall,weinthesandandgrass,thegrassallthesandboxcanfirmlyfixedinplace,aftertwokilometerstocreateashelterbelts,sothattheeffectiveregulationofregionalclimate.Scientistssaidthatinthiswaycanpreventnearly80%ofthesandintotheMogaointernal. 　　Intheprotectionofourpreciousworldculturalheritage,wereallymadesomeencouragingprogress,butitshouldnotonlybeatemporaryrescueworks.Thesefactorsbroughtaboutbynaturalhazards,willnodoubtcontinue,threatsstillexistfortheMogaoGrottoes,forwhicheffortsalsoneedtolastforever,generationaftergeneration. 　　Dearfriends,letusjoinhandstogethertoprotectoursplendidancientcivilization.Wemayalsoslightlyyounger,butaslongaswehaveafirmbelief,jewelswillshineforever.Ourspiritwillspreadfromonepersontoanotherperson