介绍兰州家乡关于天气的英语作文

Lanzhouissituatedinthetemperatezoneandenjoysasemi-aridclimate(KöppenBSk)withhotsummersandverycoldanddrywinters.Meanannualrainfallis315millimetres(12.4in),almostallofwhichfallsfromMaytoOctober.Thewintersaresodrythatsnowisextremelyrare.

InregardtoairpollutionLanzhouhassomeoftheworstairqualityofallcitiesinChina.AccordingtotheBlacksmithInstitute,Lanzhouisoneofthe30mostpollutedcitiesintheworld,withitsTSP(totalsuspendedparticle)rating247%abovethatoftheGansuStaterecommendation.TheairqualityissopoorthatattimesonecannotseeLanshan,themountainrisingstraightupalongthesouthsideofthecity.Atonepoint,acontroversialsuggestionwasputforwardtobulldozeamountainadjacenttothecity,inordertoletfreshairintothebowlwhereLanzhouissituated.Itwassuggestedonthepremisethatthesurroundingmountainsblockafreeflowofairinthecity.Thecityislocatedinanarrowrivervalleywithanunfortunatecurvecausingittobehemmedinwithnofreeairflow.Lanzhouisalsothehomeofmanyfactories,includingsomeinvolvedinpetroleumprocessing,andsuffersfromlargeduststormskickedupfromtheGobiDesert,especiallyinthewinterandspring.

ThereachoftheYellowRiveratLanzhoucarriesahighloadofsilt,givingtheriveritscharacteristicmuddyappearance;howeverwaterqualityinthisreachisbetterthanthefetidoutflowthatbarelypassesforwatertwohoursdownstream

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