tuck [tVk] vt. 1.把(衬衫、餐巾等)的边塞到下面(或里面)2.把...夹入, 把...藏入 n.(衣服等的)褶, 裥 【例】The baby's dress was beautifully tucked with tiny stitches. 婴儿衫的褶裥打得针脚细密，很漂亮。He tucked his shirt into his trousers. 他把衬衫下摆塞入裤中。He was asleep before I tucked him in. 我还没来得及给他盖好被子，他就睡着了。
tug [tVg] v. 用力拖(或拉) n.1.拖船2.猛拉, 牵引 【例】Tom felt a tug at his sleeve. 汤姆觉得有人拉了拉他的衣袖。She tried to tug my hand away. 她试图把我的手拉开。
tuition [tju:'iSn] n.1.(某一学科的)教学, 讲授, 指导2.学费
tumble ['tVmbl] vi. 1.跌倒, 摔下, 滚下2.翻滚3.(价格等)暴跌4.不由自主地卷入 n.跌倒, 摔倒 【例】She tumbled down the stairs. 她滚下了楼梯。The little girl stared at the little cats tumbling over each other in their basket. 小女孩凝视着在篮子里互相翻来滚去的小猫。
tune [tju:n] n.曲调, 曲子 vt. 1.为(乐器)调音2.调节, 调整 【例】He played a tune on the violin. 他用小提琴演奏了一首曲子。She calls the tune in their house. 他们家中她说了算。The orchestra tuned their instruments. 乐队在给乐器调音。
turbine ['tK:bain] n.涡轮机, 汽轮机
turbulent ['tK:bjulKnt] a. 1.动荡的, 混乱的2.汹涌的, 狂暴的 【同】violent; stormy; disturbed; noisy 【例】It took place in a turbulent period of history. 这件事发生在骚乱不安的历史时期。The sea is too turbulent for sailing. 海浪太大，不宜航行。She tried to calm her turbulent thoughts. 她试图平息一下紊乱的思绪。
turkey ['tK:ki] n.火鸡, 火鸡肉 【例】People often drink white wine with turkey. 人们经常边吃火鸡肉边喝白葡萄酒。
turning ['tK:niN] n.旋转；变向；转弯处
turnip ['tK:nip] n.萝卜，芜菁 【例】Would you like some turnip? 吃点芜菁吗？
turnover ['tK:nKuvK] n.1.营业额, 成交量2.人员调整, 人员更替率
typical ['tipikl] a. 典型的, 有代表性的 【同】characteristic; usual; illustrative 【例】He crushed the beetle deliberately which is very typical. 他有意把那只甲壳虫踏碎，只有他才会这样做。
typist ['taipist] n.打字员
U
ultraviolet [,VltrK'vaiKlKt] a. 紫外(线)的 【例】They use ultraviolet lamp to kill pests. 他们使用紫外线灯杀死害虫。
unanimous [ju'n<nimKs] a. 全体一致的, 一致同意的 【同】unified; combined; single 【例】The country is unanimous in support of the government’s policy. 全国一致支持政府的政策。Politicians from all parties were completely unanimous in condemning his action. 所有党派的政治家们都一致谴责他的行为。The committee were unanimous that the application should be turned down. 委员会一致同意拒绝这项申请。
unbearable [Vn'bEKrKbl] a.难堪的，忍受不了的 【例】The heat outside is unbearable. 外面的高温真让人难以忍受。He is unbearable when he's in a bad temper. 他发脾气时让人无法忍受。
uncertain [Vn'sK:tn] a.无常的；不确定的 【例】The uncertain weather delayed our departure. 天气变换莫测，延误了我们启程。I'm uncertain whether to go or not. 我不能肯定去还是不去。
uncertainty [Vn'sK:tnti] n. 不确定,不可靠,半信半疑 【例】The uncertainty is unbearable! 事情定不下来真让人难以忍受!   They lived in the uncertainty on the dole. 他们依靠救济金的生活不安定。
underestimate [,VndK'restimKt] vt. 对...估计不足, 低估 n.估计不足, 低估 【例】I underestimated the time we needed by 30%. 我把我们需要的时间低估了30%。Never underestimate your opponent. 千万不要低估对手。
undergo [,VndK'gKu] vt. 经历, 遭受 【同】sustain; experience; endure; withstand 【例】You cannot create experience, you must undergo it. 你不能创造经验，你必须经历它。This city underwent great changes. 这座城市经历了巨大的变化。She underwent a thorough examination at the hospital. 她在医院里接受了全面检查。I hope that I shall never again have to undergo such unpleasant experience. 我希望我永远不会再遭遇到这种不愉快的经历。
undergraduate [,VndK'gr<dZuKt] n.大学本科生 【例】He is a Harvard undergraduate. 他是哈佛大学的学生。
underline ['VndKlain] vt. 1.在...下面划线2.强调, 使突出 【同】mark a line under; emphasize 【例】To underline a poem word by word is the work of misguided schoolmaster. 在诗句下面逐字画线，那是拙劣的教师才干的事儿。Those words are underlined in the English book. 那本英语书中有些单词下画着线进行强调。Strikes by prison officers underline the need for reform in our gaols. 监狱工作人员罢工一事，突出地表明我们的 监狱制度需要改革。
underlying [,VndK'laiiN] a. 含蓄的, 潜在的
undermine [,VndK'main] vt. 1.暗中破坏, 逐渐削弱2.侵蚀...的基础 【同】dig; weaken; ruin 【例】Her health was undermined by the stress of her job. 工作压力使她健康受损。
underneath [,VndK'ni:T] prep. 在...下面, 在...底下 ad. 在下面, 在底下 n.下部, 底部 【同】mark; italicize 【例】The example sentences in this book were first underlined by a tick to tell the printer to print them in italics. 本书中例句起初用√在下面划线，以告字排员工人应用斜体排印。She was wearing a woolen coat, with a cotton blouse underneath. 她外面穿了一件毛外套，里面穿一件棉布衬衫。The underneath part felt damp. 底层很潮湿。The coin rolled underneath the piano. 硬币滚到钢琴的下面了。
undertake [,VndK'teik] vt. 1.承担, 着手做2.同意, 答应, 保证 【例】We could undertake the work for the time being. 我们可暂时担当这项工作。He undertook to finish the job by Friday. 他答应星期五之前完成这项工作。
undesirable [,Vndi'zaiKrKbl] a.不合需要的；讨厌的
undo [Vn'du:] vt. 1.解开, 松开2.取消, 撤销 【例】It's better for the doer to undo what he has done. 解铃还需系铃人。That mistake has undone all our good work. 那个过错使我们前功尽弃。Our folly has undone us. 我们的愚蠢行为将自己毁了。One of your buttons is undone. 你的一个扣子松开了。He was gone and left all the work undone to me. 他走了，把所有没做完的工作都留给了我。
uneasy [Vn'i:zi] a. 心神不安的, 担心的, 忧虑的 【同】unquiet; anxious; restless 【例】Fools are never uneasy. Stupidity is without anxiety. 愚人绝不会不安，愚蠢是没有忧虑的。I'm uneasy in my mind about the future. 我为前途而忧虑。They had an uneasy suspicion that all was not well. 他们有一种令人不安的猜疑，所有的事都不 太妙。
unexpected [,Vnik'spektid] a. 想不到的, 意外的 【同】surprising; sudden; all at once 【例】If one advances confidently in the direction of his dreams and endeavors to live the life he imagined, he will meet with a success unexpected in common hours. 一个人如果充满信心地向梦想的方向前进，努力实践所想象的生活，他就会迎来平常想不到的成功。The unexpected guest disordered his plans. 这位不速之客打乱了他的计划。
unfortunately [Vn'fO:tSKnKtli] ad. 遗憾的是, 可惜的是 【例】Unfortunately, I hurt my knee when I fell down on the ice. 真不幸，我在冰上摔倒时摔伤了膝盖。
unique [ju:'ni:k] a. 1.唯一的, 独特的, 独一无二的2.极不寻常的, 极好的 【同】peerless; matchless; unprecedented 【例】Originality is the unique way of thinking, observing, understanding and judging. 独创性就是特有的思考、观察、理解和判断的方法。It's a unique work of art. 这是独一无二的艺术作品。He's caught the unique opportunity. 他抓住了那唯一的机会。
universal [,ju:ni'vK:sl] a. 1.普遍的, 全体的2.通用的, 万能的3.宇宙的, 全世界的 【同】cosmical; global; comprehensive; general 【例】Music is the universal language. 音乐是全世界的语言。Television provides universal entertainment. 电视提供大众化的娱乐。Overpopulation is a universal problem. 人口过多是全球性的问题。
universe ['ju:nivK:s] n.1.宇宙, 万物, 世界2.领域, 范围 【例】The Earth is only one of the numerous planets in the universe. 地球只是宇宙中众多星球中的一个。
unjust [Vn'dZVst] a.非正义的；不公平的 【例】He said that the people's accusation was unjust. 他说人们的指控是不公正的。
unkind [Vn'kaind] a.不仁慈的，不和善的 【例】Don't be so unkind to your brother. 别对你兄弟这么刻薄。
unlike [,Vn'laik] prep. 不像, 和...不同 【例】Unlike my sister, I am a terrible cook. 和我妹妹不同，我是一个糟糕的厨师。Unlike his brother, he has a good sense of humor. 和他兄弟不同，他有种幽默感。
unlimited [Vn'limitid] a.无限的；不定的 【例】If only one had an unlimited supply of money! 要是财源不断就好了!   It's unlimited to drive cars at high speed in country. 在乡村开快车没有限制。
unlock [Vn'lOk] vt.开门，箱等 【例】Scientists have unlocked the secret of the atom. 科学家已经揭开了原子的秘密。I unlocked the door and went into the room. 我打开房门，然后走进屋里。
unpaid [Vn'peid] a.未付的；不支薪水的
untie [Vn'tai] vt.解开，松开；解放 【例】Untie me from the chair. 把我从椅子上解开。I tried to untie the string but failed. 我试图解开绳子，但没有成功。
unusual [Vn'ju:ZuKl] a. 1.不平常的, 少有的2.与众不同的, 独特的 【同】exceptional; odd; strange 【例】It requires a very unusual mind to undertake the analysis. 分析显而易见的事物需要极不寻常的头脑。Snow is an unusual sight in this warm place. 下雪在这个温暖的地方是一种罕见的景象。
update [,Vp'deit] vt. 更新, 使现代化 n.最新信息 【例】The data should be updated once a week. 这些数据应该每星期更新一次。
upgrade ['Vpgreid] vt. 提升, 使升级 n.向上的斜坡
uphold [,Vp'hKuld] vt. 支持, 维护 【同】support; maintain; confirm; sustain 【例】I upheld him in his policy. 我支持他的政策。The President swore to uphold the constitution. 总统宣誓维护宪法。The judge upheld the lower court's decision. 法官维持初级法院的判决。
upright ['Vprait] a. 1.直立的, 竖立的, 垂直的2.正直的, 诚实的 ad. 挺直着, 竖立着 【例】Several columns among the ruins still stood upright. 在废墟中依然挺立着几根柱子。
uproar ['VprO:] n.吵闹, 喧嚣, 骚乱 【例】There was uproar over the tax increase. 增税引起了一片怨声。His motion threw the meeting into an uproar. 他的建议在会上引起了一片吵嚷。
upset ['Vpset] vt. 1.使心烦意乱, 使苦恼, 使不适2.打乱, 搅乱3.打翻, 弄翻 n.1.翻倒, 搅乱, 不安2.(肠胃等)不适 a. 1.心烦的, 苦恼的2.(肠胃等)不适的 【例】I'm always upset when I don't get any mail. 我接不到任何邮件时总是心烦意乱。The news quite upset him. 这消息使他心烦意乱。He upset a bottle of ink. 他打翻了一瓶墨水。He has an upset stomach. 他胃不舒服。
upside-down [,Vpsaid'daun] a.颠倒的，乱七八糟的 【例】The classroom was turned upside-down. 教室被弄得乱七八糟。
up-to-date [,Vp-tK-'deit] a. 1.现代化的, 最新的2.跟上时代的【例】With regard to parents, those who are traditional must keep themselves up-to-date or learn to see things the way their children do, and those who always bury themselves in work must spend some time every day with their chirdren enjoying the warmth created through exchangeds of ideas in a free atmosphere. 对于比较传统的父母亲来说，他们必须使自己跟上形势或学会从孩子的角度看问题；对于整日忙于工作的父母来说，他们必须每天抽出时间来和孩子在自由的气氛中交流，享受由此带来的温软。
urban ['K:bKn] a. 城市的 【例】You can find out many advantages in urban life. 你会发现都市生活中有许多便利之处。
urgent ['K:dZKnt] a. 急迫的, 紧要的【例】Telephone is vey convenient especially when we have something urgent.电话是非常方便的，尤其当我们有紧急事情时。Another example is more vivid: You have something urgent which has to be informed to your friend whose house is two hour’s ride away. 另外一个列子更加生动形象：如果你有急事要通知你的朋友，而它家距你家有两个小时的路程。
usage ['ju:sidZ] n.1.使用, 用法2.惯用法 【例】The tractor had been damaged by rough usage. 这辆拖拉机因使用不经心而损坏了。Languages develop continually through usage. 语言在使用中不断发展。
utility [ju:'tiliti] n.1.功用, 效用2.[常pl.] 公用事业 【同】use; service; convenience; business 【例】Nothing can have value without being an object of utility. 没有用的东西不可能有价值。Their research project has limited practical utility. 他们的研究项目实用价值很有限。
utilization [,ju:tilai'zeiSn] n.利用，效用
utmost ['VtmKust] a. 极度的, 最大的 n.极限, 极度, 最大可能 【同】ultimate; chief; highest; maximum 【例】The utmost shame is to lose one’s soul. 一个人最大的耻辱是丧失灵魂。This is not an issue of the utmost importance. 这不是一个很重要的问题。She does her utmost to please her parents. 她竭尽全力使父母高兴。She did her utmost to give pleasure to her parents. 她竭尽全力使父母高兴。She showed the utmost reluctance. 她显得极其勉强。This is an issue of the utmost importance. 这是一个极为重要的问题。
V
vacant ['veikKnt] a. 1.未被占用的, 空着的2.(职位、工作等)空缺的3.(神情等)茫然的, (心灵)空虚的 【同】void; empty; unoccupied; unintelligent 【例】Absence of occupation is not rest, a mind quite vacant is a mind distressed. 无所事事并非休息，完全空虚的头脑是不幸的。If that room is vacant, we can practice there. 如果那个房间空着，我们可以在那练习。He does not know what to do with his vacant time. 他不知道空闲时间该干点什么。
vacuum ['v<kjuKm] n.1.真空2.真空吸尘器 v. 用吸尘器清扫 【例】His wife's death left him a vacuum in his life. 他妻子的去世使他的生活变得空虚。
vague [veig] a. 含糊的, 不明确的, 模糊的 【同】opaque; unclear; ambiguous 【例】A good holiday is one spent among people whose notions of time are vaguer than yours. 一个满意的假期就是和时间概念比你的还模糊的人在一起度假。Our holiday plans are rather vague. 我们的度假计划还没有明确。I haven't the vaguest idea who he is. 我一点儿都不知道他是谁。She is so vague that I can never understand what she is trying to say. 她说话含含糊糊，我怎么也听不明白她想说些什么。
valid ['v<lid] a. 1.有根据的, 有理的2.有效的, 具有法律效力的 【同】genuine; sound; logical; solid; true 【例】I cannot prove scientifically that truth must be conceived as a truth that is valid independent of humanity; but I believe it firmly. 我无法科学地证明真理必须被视为不依赖于人类而成立的真理，不过我坚定地相信这点。The marriage was held to be valid. 这一婚姻关系是有效的。A credit card is not a valid proof of identity. 银行发的支票保付卡不是有效的身份证明文件。
validity [vK'liditi] n.有效，效力；正确
valve [v<lv] n.1.阀, 活门2.(心脏的)瓣膜, (管乐器的)活瓣 【例】Have you turned off the water valve? 你关掉水阀了吗？
van [v<n] n.运货车, (载客的)面包车 【例】He brought three people to the party in his van. 他用客货车载了三个人来参加聚会。
vanish ['v<niS] vi. 1.突然不见, 消失2.不复存在, 绝迹 【例】Many types of animals have now vanished from the earth. 很多种类的动物现在已经从地球上绝迹了。After the alien spacecraft had hovered over the park for a short time, it vanished. 那只外星来的宇宙飞船在公园上空盘旋了一会儿之后就不见了。
vanity ['v<niti] n.1.自负, 自大, 虚荣2.空虚, 无用, 无价值 【同】pride; arrogance 【例】Vanity is the quicksand of reason. 虚荣心是吞噬理智的流沙。She married the rich man out of vanity. 她出于虚荣心而嫁给了那个富人。
vapour ['veipK] n.(蒸)汽 【例】A cloud is a mass of vapour in the sky. 云是天空中的水汽团。Water can be changed into vapour when heated. 水被加热时，可以变成水蒸汽。
variable ['vEKriKbl] a. 1.易变的, 多变的2.可变的 n.可变因素, 变量 【例】Winds are mainly light and variable. 风力较弱，风向多变。His mood is variable. 他的情绪多变。The temperature was a variable in the experiment. 在该实验中温度是个变量。
variation [,vEKri'eiSn] n.1.变化, 变动2.变体, 变种3.变秦(曲) 【例】Prices have not shown much variation this year. 今年物价没显出多大变化。The dial records showed a very slight variation in pressure. 刻度盘显示出压力有极微小的变化。
vary ['vEKri] vi. 变化, 有不同, 呈差异 vt. 改变, 使不同 【例】The size of the apples varied. 那些苹果大小不同。She varied her dress as fashion changes. 她的衣着随着潮流而变化。
vegetarian [,vedZi'tEKriKn] n. 素食者
vegetation [,vedZi'teiSn] n.植物, 草木 【例】The colorful vegetation of this tropical forest amazed the professor. 这片热带森林色彩纷呈的植被使教授惊讶。
velocity [vi'lOsKti] n.速度, 速率 【同】quickness; swiftness; rapidity; speed 【例】Gazelles can move with astonishing velocity. 羚羊跑起来有地速度惊人。Gazelles can move with astonishing velocity. 羚羊跑起来速度惊人。The car was moving at such a velocity! 那辆汽车的速度简直太快了!
velvet ['velvit] n.天鹅绒, 丝绒 【例】This velvet dress is very beautiful. 这件天鹅绒礼服非常美丽。
ventilate ['ventileit] vt. 1.使通风2.把…公开, 公开讨论 【同】freshen; air; cool; oxygenate 【例】My office is well-ventilated. 我的办公室通风良好。My office is well ventilated. 我的办公室通风良好。They are ventilating the sap of a coal mine. 他们正在使煤矿坑道通风。
venture ['ventSK] n.风险投资, (商业等的)风险项目 vi. 冒险, 大胆行事 vt. 1.敢于, 大胆表示2.拿…冒险, , 冒…的险 【同】adventure; risk; hazard 【例】Nothing ventures, nothing have. 不冒险就没收获。He ventured his life to save a little girl from drowning. 他冒生命危险救起了一个小女孩，使她免于淹死。He chose a book at a venture from the shelves. 他从书架上随便挑了一本书。
verbal ['vK:bl] a. 1.口头的2.用言辞的, 用文字的3.动词的 【同】oral; spoken; colloquial 【例】His verbal ability is beyond description. 他的口头能力无法形容。The teacher teaches us the verbal skills. 老师告诉我们使用言辞的技巧。I am making a verbal translation. 我正在逐字的翻译。
verdict ['vK:dikt] n.1.定2.定论, 判断性意见 【例】The jury announced their verdict. 陪审团做出了裁决。They have had the verdict of the electors. 他们已经知道了选举人的决定。
verify ['verifai] vt. 1.核实, 查对2.证明, 证实 【同】establish; authenticate; prove; check 【例】With the past, as past, I have nothing to do; nor with the future. I live now, and will verify all past history in my own moments. 我与作为过去的过去毫无牵连，与作为未来的未来亦无关系。我生活在现在，我将在自己的生涯中验证整个过去的历史。The computer verified whether the data was loaded correctly. 计算机查实数据输入是否正确。The truth verified the allegations. 事实证明了这些说法。
versatile ['vK:sKtail] a. 1.多才式艺的, 有多种技能的2.有多种用途的, 多功能的, 万用的 【同】skillful; knowledgeable 【例】What a versatile musician he is! 他是多么有才华的音乐家啊!
verse [vK:s] n.诗, 诗句 【例】This play was written in verse. 这个剧本是用诗体写成的。There are four verses in each poem. 每首诗有四个诗节。
version ['vK:Sn] n.1.版本, 译本2.说法 【同】translation; account 【例】The two newspapers gave different versions of what happened. 两家报纸对发生的事说法不一。The book was translated into many versions and sold all over the world. 这本书被翻译成多种译文并行销全球。This shirt is a cheaper version of the one I saw in that shop. 这件衬衫同我在那家商店里见到的几乎一样，但它是便宜货。
versus ['vK:sKs] prep. 1.以…为对手, 对2.与…相对, 与…相比之下
vertical ['vK:tikl] a. 垂直的, 竖的, 纵向的 【例】The northern face of the mountain is almost vertical. 这座山向北的一面几乎是垂直的。
vest [vest] n.背心, 马甲(无袖的)防护衣 vt. (in )授予, 赋于, 给予(权力, 财产等) 【例】He only wears a vest in the room. 他在家里只穿了一件背心。The constitution vests the president with the power to declare war. 宪法授予总统宣战权。
veteran ['vetKrKn] n.1.老兵2.经验丰富的, 老手 【例】His grandfather was a veteran of the World War II. 他的祖父是二战时的老兵。This washing machine is really a veteran. 这台洗衣机真是老古董了。
veto ['vi:tKu] vt./n. 否决 【例】Japan exercised her veto to block the resolution. 日本使用了否决权反对该项决议。They carried the ministerial veto. 他们行使了内阁否决权。The president last week vetoed the tax cut. 总统上个星期否决了减税法案。
via ['vaiK] prep. 经由, 经过, 通过 【例】We shall go from London to Washington via New York. 我们将从伦敦经过纽约到华盛顿。I can send him a note via the internal mail system. 我可以通过内部通信系统给他发个通知。
vibrate [vai'breit] v. (使)振动, (使)摇摆 【例】The whole house vibrates whenever a heavy lorry passes. 重型卡车一经过，整所房子都震动起来。His voice vibrated with passion. 他激动得声音发颤。
vice [vais] n.1.缺点, 弱点2.邪恶(行为), 道德败坏(行为) 【同】corruption; wickedness; evil 【例】It has ever been my experience that folks who have no vices have very few virtues. 我一向的经验是，全无缺点的人也几乎没有优点。Drunkenness is his sole vice. 酗酒是他唯一的恶习。
vicinity [vi'siniti] n.周围地区, 临近地区 【同】nearness; neighborhood; environment 【例】A kind heart is a fountain of gladness, making everything in its vicinity freshen into smiles. 善良的心是快乐的源泉，使近旁的一切都绽开笑容。All the ships in the vicinity of the crash joined in the search for survivors. 撞船事故发生地区的所有船只都参加了搜寻幸存者的工作。