简介:重点词汇1.unbelievableadj.难以置信的;不真实的Ifindthisstorybothfascinatingandunbelievable.我觉得这个故事非常有趣和难以置信。拓展(1)believableadj.可相信的;可信任的Herexplanationcertainlysoundedbelievable.她的解释听起来的确可信。(2)believev.相信;认为真实Idon’tbelieveyou.我不相信你的话.Idobelieveyou’reright.我的确相信你是对的。2.progressv.&n.进步;进展
简介:重点词汇1.treasuren.珠宝;财富treasure意为'珠宝;财富'时,是不可数名词。Anation’streasureisinitsscholars.学者是国家的财富。拓展(1)treasuren.珍品treasure意为'珍品'时,是可数名词。Thehousewaslargeandfullofarttreasures.那栋房子很大,里面满是艺术珍品。(2)treasurev.珍爱;珍重Itreasurehisfriendship.我珍重他的友谊。2.hurryv.匆忙;赶快hurrytodosth匆忙做某事Thekidshurriedtoopentheirpresents.孩子们急忙打开礼物。
简介:笔者从认知语言学视角结合意象图式对“have+-en”构式义进行剖析,指出:“have+-en”构式兼具状态现在时、习惯性现在时、瞬间现在时、结果义、存在义以及持续义六大语义特征。该构式在表达持续义时,中心动词须为持续动词,其他情况下也可为非持续动词。“have+-en”构式存在具体例示在不同语境下可以进行结果义、存在义与持续义间的转换。结果义与瞬间现在时、存在义与习惯性现在时、持续义与状态现在时的结合分别为建构该构式的意象图式提供了基础。“have+-en”构式的意象图式刻画加深了该语法构式的理解并对教学有一定启示。
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简介:Background:Inthecontextofecosystemmanagement,thepresentstudyaimstocomparethenaturalandthepresent-dayforestedlandscapesofalargeterritoryinQuebec(Canada).Usingcontemporaryandlong-termfirecycles,eachnaturalforestlandscapeisdefinedaccordingtothevariabilityofitsstructureandcomposition,andcomparedtothepresent-daylandscape.Thisanalysiswasconductedtoaddressthequestionofwhetherhumanactivitieshavemovedtheseecosystemsoutsidetherangeofnaturallandscapevariability.Methods:Thestudyencompassedaforestedareaof17.5000km^2dividedinto14landscapes.Usingaframeworkthatintegratesfirecycles,agestructureandforestdynamics,wecharacterizedtheforestcompositionandagestructuresthatresultedfromthreehistoricalfirecycles(110,140,and180years)representativeoftheborealforestof.easternCanada.Themodelednaturallandscapeswerecomparedwithpresent-daylandscapesinregardtotheproportionofold-growthforests(landscapelevel)andtheproportionoflate-successionalforeststands(landscapelevelandpotentialvegetationtype).Results:Fourlandscapes(39%)remainwithintheirnaturalrangeofvariability.Incontrast,ninelandscapes(54%)showalargegapbetweennaturalandpresent-daylandscapes.Theseninearelocatedinthesouthernportionofthestudyarea,andaremainlyassociatedwithAbies-BetulavegetationwherehumanactivitieshavecontributedtoastrongincreaseintheproportionofPopulustremuloidesstands(early-successionalstages)andadecreaseofoldgrowthforeststands(morethan100yearsold).Asinglelandscape(7%),substantiallychangedfromitspotentialnaturalstate,isacandidateforadaptive-basedmanagement.Conclusion:Comparisonofcorrespondingnatural(referenceconditions)andpresent-daylandscapesshowedthattenlandscapesreflectinganimportantshiftinforestcompositionandagestructurecouldbeconsideredbeyondtherangeoftheirnaturalvariability.Thedescriptionofalandscape'snaturalvariabili