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1、ErosionUnitThreeJinyanYang10-11-2010NewWords&PhrasesErosion:Thegroupofnaturalprocesses,includingweathering,dissolution,abrasion,corrosion,andtransportation,bywhichmaterialiswornawayfromtheearth'ssurface.腐蚀，侵蚀：指使材料从地表磨损、消耗的一组自然过程，包括风化、溶解、磨蚀、浪蚀、腐蚀和搬运.fluvialerosion河流侵蚀
2、geologicerosion地质侵蚀loesserosion黄土侵蚀rainfallerosion降雨侵蚀rillerosion细沟侵蚀rivererosion河流侵蚀sheeterosion片状侵蚀streambankerosion河岸侵蚀winderosion风蚀冲积层：河床、洪水淹没的平原或三角洲中的流水淤积所产生的沉积层.Alluvium:Sedimentdepositedbyflowingwater,asinariverbed,floodplain,ordelta.alluvial：冲积的，淤积的.Erode:Tow
3、ear(something)awaybyorasifbyabrasion;Tocausetodiminish,deteriorate,ordisappearasifbyeatingintoorwearingaway.腐蚀；侵蚀：（象）被磨擦损耗掉;侵蚀掉，腐蚀掉：象磨蚀、侵蚀那样使…减少、减弱或消失.Silt:1）n.（名词）Asedimentarymaterialconsistingofveryfineparticlesintermediateinsizebetweensandandclay；泥沙，淤泥：由大小介于沙和泥之间的
4、非常细小的微粒构成的沉淀性物质2）v.intr.（不及物动词）Tobecomefilledwithsilt;被淤塞：使塞满泥沙3)v.tr.（及物动词）Tofill,cover,orobstructwithsilt.使淤积：用沙充满、覆盖或阻碍Siltation：冲积作用，淤积作用.耕地：已耕作的土地耕种：开垦土地Tillage:Landthathasbeentilled;Cultivationofland.黄土：一种风沉积而成的颗粒细小、含钙质的沙或泥土，呈浅黄色或黄褐色.Loess:Abufftograywindblownd
5、epositoffine-grained,calcareoussiltorclay.Translation1)Athinlayeroftopsoiliswashedofffieldsyearafteryearuntileventuallynothingisleftbutpoor-qualitysub-soilthatrequiresmoreandmorefertilizerandwatertoproduceanycropatall.2)Theneteffect,worldwide,ofthisgeneral,widespread
6、topsoilerosionisareductionincropproductionequivalenttoremovingabout1%ofworldcroplandeachyear.3)Thetotalannualsoillossfromcroplandsisthoughttobe25billionmetrictons.Abouttwicethatmuchsoilislostfromrangelands,forests,andurbanconstructionsiteseachyear.4)Itdoesn’ttakemuch
7、mathematicalskilltoseethatifyoulosetwiceasfastasitisbeingreplaced,eventuallyitwillrunout.5)Windcanequalorexceedwaterinerosiveforce,especiallyinadryclimateandonrelativelyflatland.Whenplantcoverandsurfacelitterareremovedfromthelandbyagricultureorgrazing,windliftslooses
8、oilparticlesandsweepsthemaway.6)Populationpressuresandpreemptionofgoodbottomlandsforcashcropproductionhaveforcedfarmerstotrytogrowc
