Unit4Vocabsandexpressionsinunderstandingideastrackv/n1.跟蹤，追蹤vttracksb/sth我們繼續(xù)用雷達跟蹤那架飛機。wecontinuedtrackingtheplaneonourradar.2.tracksb/sthdown追蹤到；追查到警方至今未能追捕到攻擊者thepolicehavesofarfailedtotrackdowntheattackers.課文：Howwouldyoufeelifmovingtoanewtownmeantlosingtrackofyourfriends?losetrackof不了解...的情況/動態(tài)/失去聯(lián)系keeptrackof跟蹤...情況/保持聯(lián)系銀行賬單有助于你了解錢的使用情況Bankstatementshelpyoukeeptrackofwhereyourmoneyisgoing.兩位朋友在戰(zhàn)爭中失去了聯(lián)系Thetwofriendslosttrackofeachotherinthewar拓展：runningtrack跑道ontheright/wrongtrack思路對頭/不對頭stay/keepintouchwith/keeptrackof保持聯(lián)系losetouchwith/losetrackof失去聯(lián)系getintouchwith取得聯(lián)系我們大學畢業(yè)之后仍然著聯(lián)系wekeptintouchwitheachotherafterwegraduatedfromuni.Nowadays,wecanmovearoundtheworldandstillstayintouchwiththepeoplethatwewanttoremainfriendswith.advancen/vadvanceinsth進展[C]多虧了技術(shù)的進步Thankstoadvancesintechnologyinadvance(of)提前如果提前訂票，價格要便宜一些Ifyoubooktheticketsinadvance，thepricewillbecheapter.advanceV1.moveforwardvi部隊在夜幕降臨前向前推進了20英里。Thetroophadadvanced20milesbynightfall.2.develop這項研究提高了我們對語言學習的認識Theresearchhasdonemuchtoadvanceourunderstandingoflanguagelearning.拓展advancedadj高級的先進的intermediateadj中級的elementaryadj初級的maintainvmaintainsth維持/保持我們應該維護自然平衡weshouldmaintainthebalanceinnature這兩個國家一直保持著密切聯(lián)系。Thetwocountriesmaintainedcloserelations.拓展：Thehouseislargeanddifficulttomaintain.詞轉(zhuǎn)maintainancen維護維護，保養(yǎng)Socialmediatoolsletusseewhatourfriendsareuptoandmaintainfriendship.enablevenablesbtodosth這個新的項目能夠讓老年人有機會上大學Thenewprogramenbalesolderpeopletostudyatcollege.拓展ableadj能夠的，有能力的beabletododisablev使喪失能力disabledadj殘疾的disabilityn殘疾Thedigitalagealsoenablesustofindpeoplewhoshareourinterests...Onsocialmediasites,peopletendtopostonlypositiveupdatesthatmakethemappearhappyandfriendly.tendtodosth往往會；傾向做女性往往比男性活得更久.womentendtolivelongerthanmen.tend（to）sb/sth：careforsb/sth照顧；照料某人醫(yī)生和護士護理傷者。Doctorsandnursestendedtotheinjured.拓展：well-tendedgardens精心照料的花園well-donewell-educated..tendencyn傾向;走向theabilitytowaitwithoutbecominganxiousorangrybeanxiousaboutsth她似乎對于這次會議憂心忡忡Sheseemedanxiousaboutthemeeting.beanxioustodo渴望做某事她渴望畢業(yè)，然后找一份工作。Shewasanxioustofinishschoolandgetajob.拓展：anxiousadj-anxietyn焦慮不安渴望做某事longtodobedyingtododesiretodoPractice1.Scientistsnowusenewtoolsto________________（跟蹤動物）.2.Medicaltechnolodgy____________(突飛猛進）.3.Whereveryouare,__________________________________.(要和父母保持聯(lián)系）4.Weaimto__________________________（維護高標準）ofcustomercare.5.Thesoftware_________________________(使你能在幾秒內(nèi)登錄網(wǎng)絡）6.They_____________________（渴望見到Peter)winthegame.keeptrackoftheanim