2. undecided or unable to decide 未作决定的；无法断定的

be uncertain about 　对．．．不确定

uncle n.　 the brother of one’s father or mother, or the husband of one’s aunt伯父；叔父；舅父；姑丈；姨丈

under　 adv.　 in or to a lower place; below 在下；往下；少于

prep.　 1.　 directly below; covered by 在．．．下面，在．．．底下；被．．．遮掩着

3. to change to 变成 (辩析) turn：强调变化结果。有成为完全不同的事物的含义。例：The milk turned sour. 牛奶变酸了。turn还常用于颜色的变化。例：The trees turn green. 树变绿了。grow: 有逐渐变成新的含义，强调变化过程。例：The trees is growing tall. 那棵树逐渐长高了。become, get, go 通常表示变化的过程已经完成。其中become 比较正式，get和go较口语化。例：Tom becomes ill.汤姆病了。He has got poor.他变穷了。The food must have gone bad. 食物一定变坏了。

n. a chance or duty to do something in a particular order of time or place 依次序轮流得到的机会; 轮到的责任

turn down 关小; 调低

turn ... into... 变成; 变得; 把...... 变成......

turn off 关掉(自来水、电灯、收音机等)

turn on 开；旋开(电灯、无线电等)

turn over 翻到; 翻身; 翻(书页)

turn to 翻到; 转向; 求助于

turn up到达; 出现

twelfth [twelf ] num. 第十二

twelve [twelv] num. the number 12 十二

twentieth [tweti ] num. 第二十

twenty [twenti] num. the number 20 二十

twice [twais] adv. two times 两次; 两倍

two [tu:] num. the number 2 二

type　 [taip] v. to use a typewriter 打字

n. a kind; a sort; an example of a group 型; 类别; 典型 (辩析) kind表示种类时，指性质相同的东西；type主要指类型、样式；sort 指种类基本相似的东西，讲话时意思较含糊。

type-writer [‘taip’rait ] n. a machine for writing 打字机

typist [‘taipist] n. a person who type 打字员

ugly adj. 　unpleasant to see 丑陋的，难看的

UK 　n.　 abbrev.. United Kingdom (of Great Britain and Northern Ireland) (大不列颠及北爱尔兰) 联合王国

umbrella n.　 an arrangement of cloth over a folding frame with a handle, used for keeping rain off the head 伞，雨伞

unable adj.　 not able; without the power, knowledge, time, etc., to do something 不能的；无能为力的；不胜任的；没时间做的

uncertain adj. 1. not certain; doubtful 不确定的；不明确的；可疑的

2. to change direction 转变方向

2. to see if　 you like something, or if something works 试

try on 试穿

try one's best 竭尽全力

try out 试验

Tuesday [‘tju:zdi] n. the third day of the week 星期二

turn [t[:n] v. 1. to go around; to make something go round 转; 使转动

2. faithful 忠诚的

come true 实现

trust [tr st] v. to believe in a person or thing　 信任; 相信

n. belief in the honesty, etc. of a person 信任

truth [tru: ] n. 　what is true 真实; 实际情况, 真相; 真理

try [trai]v. 1. to do what one can; to make an attempt 试图; 尝试;验想办法

2. to give medical help to 医治; 治疗

treatment [‘tri:m nt] n. medical care from a doctor 治疗

tree [tri:] n. a large plant from which we get wood 树

trick [trik] n. practical joke 恶作剧

play a trick on 捉弄

trip [trip] n. a short journey 远足; 旅行

have a good trip 旅行愉快

trouble [‘tr bl] n. sadness, difficult, worry 烦恼; 困难; 麻烦

v. to worry, to disturb 烦恼; 扰乱

in trouble 处于困难(苦恼)中

trousers [trauz z]n.(pl.) a garment which covers the legs, usually worn by men 裤子, 长裤

truck [tr k]n. a large car for carrying heavy loads by road 卡车

true [tru:] adj. 1. correct, right, not a lie 真的, 真实的

2. a job for which some training is needed 行业; 手艺; 工作

v. buy and sell; engage in trade 交易; 经商 (辩析)business 日常用语，含义较广，泛指“做生意”，常有以利润为主的含义，例：What business are you in? trade 最普通的用词，一般不同的商业机构之间的商品交易或表示各种特殊商品的贸易和对外贸易。例：Japan does a lot of trade with China.

traffic [‘tr fik] n. cars, buses, etc. moving in the roads 交通

train [trein] n. several carriages joined together on the railway 列车; 火车

v. to teach; to practise 培养; 训练

trainer ['trein ]n. a person who trains 训练人; 教练

training ['treini ] n. training or being trained 训练; 培训

training centre 训练中心

translate [tr ns’leit] v. to change from one language into another 翻译

translate ... into... 把......译成......

transport v. [tr ns’p :t] to carry something from one place to another 运输; 输送

n.[‘tr nsp :t] the act of moving or carrying something 运输

travel [‘tr vl] v. (traveled, traveling) to go from one place to another 旅行

n. the act of travelling 旅行

treasure [‘tre　 ] n. a collection of precious things 金银财宝; 珍宝

treat [tri:t] v. 1.　 to behave towards 对待

treat ... as ... 把......当作......

2. a path or road 小径, 路, 轨道

tractor [‘tr kt ] n. a motor vehicle used for pulling farm machines 拖拉机

trade [treid] n. 1. buying and selling things 商业; 贸易; 生意; 交易

2. reach 够着

n. the action of touching 接触; 触摸

keep in touch with 与......保持联系

tour [tu ] n. a journey to visit many different places 游览; 观光

v. to travel around to see a city , country, etc. 游览; 观光 (辩析)journey: 指长时间长距离的陆地旅行，有时指海、空旅行。例：We are going to make a long journey to Xinjiang. 我们打算长途旅行到新疆去。travel: 指到远方去或长期旅行，多用复数。它和journey 不同之处在于，它没有直接向某处去的含义。例：Is he back from his travel yet? 他旅行回来了吗？trip: 着重为公出差或旅游的短途旅行，在日常用语中，常与journey 互换使用。例：He is going on a trip. 他要外出旅游。tour 指为考察、观光等巡回各地的旅行。例：a tour around Europe 环游欧洲

toward(s) [t ‘w :d(z)] prep. in the direction of 向; 朝

tower [tau ] n. a very tall building or part of a building 钟楼; 塔

town [taun] n. an area where a lot of people live, not the country 镇; 城镇

toy [tau[] n. a thing for children to play with 玩具

track [tr k] n. 1. a line of marks left by a person, thing or animal 踪迹

2. more than enough 太, 过于

too… to… 太...... 以致于不能

tool [tu:l] n. any instrument such as an axe, hammer, etc. which is held in the hands 工具

tooth [tu: ]　 n. (pl. teeth) one of the white things in the mouth with which we bite our food 牙齿

top [t p] n. the highest part or point 顶部, 最高处

adj. highest 顶上的; 最高的 on top of 在......的上面

total [‘t utl] adj. complete, whole 总的; 完全的; 整个的

n. complete amount 总数

touch [t t ] v. 1. to leave no space between; to put one's hand, fingers, etc. on or against something 碰到, 接触; 触摸