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1、Module4SandstormsinAsiaKickingUpSomeDustAtfirstglance,duststormsdonotseemveryfascinating.Windspickupfineparticlesfromtheground,andthentheairbecomesthickwithdust.Whatisinteresting,though,isthatduststormscantravelacrosstheocean,sometimesfromcontinenttocontinent.S
2、uchduststormsareworthinvestigating.InAprilofthisyear,aduststormthatoriginatedinChinaandMongoliatookasix-dayjourneyacrossmorethantenthousandkilometersofseaandopenlandtoArizonaintheUnitedStates.Thecloudwassodensethatitseemedasifthesunweresettingearly.Atleastonepe
3、rsonthoughtavolcanohaderupted.Althoughtravelingduststormsarenothingnew,thedustnowoftencontainschemicalormetallicsubstancesthatcontributetorespiratory1illnessesanddamagetheenvironment.Atpresent,someresearchersinAsiaarestudyingaerosolparticlesandtheireffectsonthe
4、environment—andtheyhaveplentyofdusttoworkwith.Duststormsareoneoftherepercussions2ofhumansmessingaroundwithMotherNature.Althoughtheyareanaturalphenomenon,duststormshavebeenoccurringmoreoften,atshorterintervals,andwithgreaterforceinrecentyears,andhumanactivityist
5、hecause.Itisafactthatexcessive3herdingofanimalsandexploitationofgrasslandsareresponsibleforthemajorityofduststorms.Thismeansthatduststormsarelargelyaresultofhumanactions;inotherwords,theyarecontrollable.Weseemtothink,however,thateconomicdevelopmentandpreservati
6、onoftheenvironmentcannotgohandinhand.Formostcountries,economicdevelopmentcomesfirst,attheexpenseoftheenvironment.Itishightimeeveryonecametogripswiththeconsequencesofoverusingtheearth’sresources,includingthemisuseoflandinthepursuitofeconomicwealth.译文大地的怒吼──沙尘暴乍看
7、之下,沙尘暴似乎不怎么引人注意。地面的细沙被风卷起,空气中便充满厚厚的灰尘。但有趣的是,沙尘暴能穿洋渡海,有时还能横越大洲。这样的沙尘暴值得我们去好好研究一下。今年四月,源自中国大陆及蒙古内陆的沙尘暴,在六天中跨越了一万多千米的海洋与空旷陆地,最后到达美国亚利桑那州。阴云密布,就像太阳将提早要下山,有人居然以为是火山爆发了。虽然移动的沙尘暴没什么稀奇,但现在那些沙尘通常含有引起呼吸道疾病和破坏环境的化学或金属物质。现在亚洲有一些研究人员正在研究悬浮颗粒及其对环境的影响──他们要研究的沙尘可多着呢!沙尘暴就是人类任意破
8、坏大自然,所造成的影响之一。沙尘暴虽是自然现象,但是近年来发生的频率却逐渐增加,间隔的时间也愈来愈短,破坏力更强大了,人类活动正是罪魁祸首。事实上,沙尘暴形成的主要原因是过度放牧及滥垦草原,这表明沙尘暴大多是人的活动所导致,也就是说,它们是可加以控制的。不过,我们似乎认为经济发展与环境保护无法同时兼顾。对大部分国家来说,经济发展是第一位的,为此
