急!请大家人工帮忙翻译一下谢谢!Leaddeposits,whichaccumulatedinsoilandsnowduringthe1960’sand70’s,wereprimarilytheresultofleadedgasolineemissionsoriginatingintheUnitedStates.InthetwentyyearsthattheCle

　　急!请大家人工帮忙翻译一下谢谢!

　　Leaddeposits,whichaccumulatedinsoilandsnowduringthe1960’sand70’s,wereprimarilytheresultofleadedgasolineemissionsoriginatingintheUnitedStates.InthetwentyyearsthattheCleanAirActhasmandatedunleadedgasuseintheUnitedStates,theleadaccumulationworldwidehasdecreasedsignificantly.

　　AstudypublishedrecentlyinthejournalNatureshowsthatair-borneleadedgasemissionsfromtheUnitedStatesweretheleadingcontributortothehighconcentrationofleadinthesnowinGreenland.ThenewstudyisaresultofthecontinuedresearchledbyDr.CharlesBoutron,anexpertontheimpactofheavymetalsontheenvironmentattheNationalCenterforScientificResearchinFrance.AstudybyDr.Boutronpublishedin1991showedthatleadlevelsinarctic(北极的)snowweredeclining.

　　Inhisnewstudy,Dr.BoutronfoundtheratiosofthedifferentformsofleadintheleadedgasolineusedintheUnitedStatesweredifferentfromtheratiosofEuropean,AsianandCanadiangasolinesandthusenabledscientiststodifferentiate(区分)theleadsources.ThedominantleadratiofoundinGreenlandsnowmatchedthatfoundingasolinefromtheUnitedStates.

　　InastudypublishedinthejournalAmbio,scientistsfoundthatleadlevelsinsoilintheNortheasternUnitedStateshaddecreasedmarkedlysincetheintroductionofunleadedgasoline.

　　Manyscientistshadbelievedthattheleadwouldstayinsoilandsnowforalongerperiod.

　　TheauthorsoftheAmbiostudyexaminedsamplesoftheupperlayersofsoiltakenfromthesamesitesof30forestfloorsinNewEngland,NewYorkandPennsylvaniain1980andin1990.Theforestenvironmentprocessedandredistributedtheleadfasterthanthescientistshadexpected.

　　Scientistssaybothstudiesdemonstratethatcertainpartsoftheecosystem(生态系统)respondrapidlytoreductionsinatmosphericpollution,butthatthesefindingsshouldnotbeusedasalicensetopollute.

　　我这有机器翻译的你可以参考一下：

　　铅存款,——累积在土壤和雪中1960的,70的,主要地结果的含铅汽油汽油废气起源配偶探视.时间状语那根据清洁空气法委任统治了无铅汽油使用配偶探视,铅积累全世界减少了意味深长地.

　　一个论文发布最近在美国自然杂志节目,空气传播含铅气体汽油废气从美国是铅贡献者铅的高浓度在雪中在格陵兰.新的书房是一个结果的继续研究领导由.博士查尔斯boutron,一个专家在重金属的碰撞在环境在来源于法国的在法国.一个论文由.博士boutron发布1991年显示那铅