Unit4WeatherandClimateOverviewText1WhatMakestheWeather?Text2TypesofClimateScanningDothereadingcomprehensionexerciseonpage48and49.Keywordsandexpressionsfluctuate

(L1)v[I,Ipr]~(betweenAandB)1(ofaprice,number,rate,etc)riseandfall;changeirregularly（指價(jià)格﹑數(shù)量﹑比率﹑費(fèi)用等）漲落,波動(dòng):Thepricefluctuatesbetween5and6.價(jià)格在5英鎊與6英鎊之間波動(dòng).

2(ofanattitudeorastate)changecontinuallyandirregularly;waver（指態(tài)度或狀態(tài)）變化不定,動(dòng)搖:fluctuatingopinions

變化不定的意見(jiàn).fluctuation

[C,U]~(of/insth):widefluctuationsoftemperature溫度的巨大變化fluctuationsinthestateofhishealth

他健康狀況時(shí)好時(shí)壞的變化.prevail

(L5)v[I]~(among/insth/sb)existorhappengenerally;bewidespread普遍存在;普遍發(fā)生;盛行;流行:

Theuseofhorsesforploughingstillprevailsamongthepoorerfarmers.用馬耕作的現(xiàn)象在貧苦農(nóng)民中仍然十分普遍.

[I,Ipr]~(against/oversb/sth)(fml文)fightsuccessfully(againstsb/sth);defeat戰(zhàn)勝（某人[某事物]）;擊敗:Virtuewillprevailagainstevil.美德定將戰(zhàn)勝邪惡.prevailingadj[attrib作定語(yǔ)](a)普遍的;盛行的;流行的:theprevailingcustoms,fashions,style,etc

流行的風(fēng)俗﹑式樣﹑款式等.(b)（指風(fēng)）某一區(qū)域里最常刮的:Theprevailingwindhereisfromthesouth-west.這里最常刮的風(fēng)是西南風(fēng).slanting,vertical(L9)equator(L16)赤道Globe-relatedwords北、南回歸線tropicofCancer/Capricorn北、南半球northern/southernhemisphere地軸axis北、南極North/SouthPole北、南極圈Arctic/AntarcticCircle經(jīng)、緯線thelineoflongitude/latitudesaturatedadj[L42]

1[usupred通常作表語(yǔ)]verywet;soaked極濕;濕透:Iwentoutintherainandgotsaturated.我冒著雨出門,渾身都淋透了.

2[usuattrib通常作定語(yǔ)](chemistry化)(ofasolution)containingthegreatestpossibleamountofthedissolvedsubstance（指溶液）飽和的:asaturatedsolutionofsalt

飽和的食鹽溶液.condense

(L43)v[I,Ipr,Tn,Tn.pr]~(sth)(into/tosth)(a)(causesthto)becomethickerormoreconcentrated（使某物）變稠或變濃;濃縮:

condensedmilk,soup,etc

煉乳﹑濃縮湯等.(b)(causesthto)changefromgasorvaportoaliquid（使某物）由氣體或蒸氣變成液體;凝結(jié):Steamcondenses/iscondensedintowaterwhenittouchesacoldsurface.蒸氣接觸冷的表面而凝結(jié)成水珠.constant

(L50)1[usuattrib通常作定語(yǔ)]goingonallthetime;happeningagainandagain經(jīng)常的;不斷發(fā)生的:constantchattering,complaints,interruptions沒(méi)完沒(méi)了的饒舌﹑抱怨﹑打攪2unchanging;fixed不變的;恒定的;穩(wěn)定的:aconstantspeed,value,etc恒定速度﹑恒值等Pressureinthecontainerremainsconstant.容器中的壓力保持恒定不變.variation

(L52)[C,U]~(in/ofsth)(degreeof)varyingorbeingvariant變化,變動(dòng),變異（的程度）:Priceshavenotshownmuchvariationthisyear.今年物價(jià)沒(méi)顯出多大變化.Currencyexchangeratesarealwayssubjecttovariation.貨幣兌換率是經(jīng)常變的.

SentenceLearningMusicsentoutbyaradiotransmitterdoesnotfilltheairwithsoundsforalltohear.Instead,themusictravelsintheformofelectromagneticwaves,whichmustpassthroughareceiverandanamplifiertobeheard.(L17）無(wú)線發(fā)射器傳送的音樂(lè)并沒(méi)有使空氣中充滿人們能聽(tīng)見(jiàn)的聲音，而是以電磁波的形式在經(jīng)過(guò)接收器和擴(kuò)音器之后才能被人們聽(tīng)見(jiàn)。TypesofClimateScanningDothereadingcomprehensionexerciseonpage58and59.Translation降雨量theamountofrainfall熱帶雨林tropicalrainforest熱帶草原氣候tropicalwet-and-dryclimate/tropicalsavanna熱帶沙漠氣候tropicaldesertclimate地中海氣候Mediterraneanclimate西風(fēng)westerlywinds用材林timberforest濕潤(rùn)的大陸性氣候humidcontinentalclimate極地氣候polarclimate高原氣候highlandclimate洋流oceancurrent拉布拉多洋流LabradorCurrent灣流/墨西哥灣暖流GulfStream季風(fēng)monsoon/m?nˋsu?n/SentencelearningThewatercyclecanbecontrolledinpartforashorttimebystoringwaterinreservoir