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1、Lesson1WORDS1.sleetn.冻雨，雨夹雪2.dependvi.依赖,取决于3.hailn.雹4.formvt.,vi.形成5.lowa.低的6.temperaturen.温度7.moleculen.分子8.clingvi.粘着9.dropletn.小水滴10.dustn.灰尘11.particlen.粒子,微粒12.nucleusn.核,原子核13.dewn.露水14.crystaln.晶体15.condensationn.冷凝,凝结16.rapida.快的17.moisturen
2、.湿气,水分18.freezevi.结冰19.raindropn.雨点20.insteadad.代替,替换21.snowflaken.雪片22.shapen.形状23.flaken.薄片24.hexagonala.六角形的25.lensn.透镜26.strikevt.,vi.打击击中,撞27.thunderstormn.雷雨28.swifta.迅速的29.currentn.气流,潮流30.tossvt.,vi.抛,扔,颠簸31.acquirevt.取得,获得32.hailstonen.冰雹33.
3、stickvi.粘住34.theoryn.理论35.explainvt.说明,解释,阐明PHRASESANDEXPRESSIONSThemorethemore越…越…Sothat如此…以致…Takeplace发生Assoonas一…就…Highabove大大高于Wellbelow远远低于Takeon呈现Abitof一点Amassof一块Startout出发,着手进行layerof一层TEXTRAIN,SNOW,SLEET,ANDHAILTheformingofraininaclouddepend
4、supontemperature.Thelowerthetemperature,themorethemoleculesofwatervaporinthecloudclingtogether.Thentheyformdropletsofwater.Usuallydropletsformarounddustorotherparticlesintheairwhenthedewpointisreached.Ificecrystalsareinthecloud,evenmoredropletsmayfor
5、m.Inclouds,condensationmaybesorapidthatmillionsofdropletsofwaterareformed.Asthesedropletscollectmoremoleculesandthereforebecomeheavier,theirweightmakesthemfalltotheearth.Ifthetemperatureoftheairisabovefreezingthedropswillfallasrain.Whentheairhighabov
6、etheearthiswellbelowfreezing,themoistureintheairdoesnotformraindrops.Instead,itformssnow.Snowflakestakeonmanyinterestingshapes.Theyseemtobeformedaroundacenter.Snowismadeupofmillionsoftheseflakes,eachabitofwatervaporthatinfreezingtemperatureswaschange
7、dintoaflakeofsnow.Snowflakesarereallycrystals;theyarewatermoleculesgroupedinahexagonalpattern.Itisinterestingtostudysnowflakecrystalsunderahandlens.Sometimesdropletsofwaterstartoutasrainandchangeintoanotherformontheirwaytotheearth.Theraindropsmaystar
8、tdownwardthroughalayerofwarmairandthenstrikeamassofcoldair,whereeachraindropfreezes.Thesefrozenraindropsfalltotheearthassleet;skeetusfrozenrain.Sometimesstillanotherchangemaytakeplaceindropsofrain.Duringathunderstorm,swiftupwardcurrentsofairusuallyca
