2. very useful 寶貴的,有價值的

valuably adv.

value n; invaluable adj. 千金難買的。

ant. valueless 毫無價值的。

value ['v lju:] n. 1. the degree of usefulness of something 重要性，用途，益處

2. to act together for a purpose (為一定目的而)聯(lián)合行動，一致行動

united adj. 1 joined in a state of love, agreement, etc. 團結(jié)的，和睦的

2 with everyone concerned having the same aim 一致的，統(tǒng)一的

3 (cap. In names) (作名稱時

大寫) joined in a political organization結(jié)合于一個政治組織內(nèi)的

universe n. (often cap.) (常大寫) all space and the matter which exists in it 宇宙；世界；天地萬物

unknown n.& adj. (a person or thing) whose name, value, or origin is not known(人或事物的名稱、價值或起源)未知的，未被發(fā)現(xiàn)的，不了解的；未知的人(或事物)

university n. 大學

unless conj. if not; except if 如果不；除非

unpleasant adj. not pleasant; causing dislike; not enjoyable; unkind 使人不愉快的；討厭的；不合意的；不和善的

-unpleasantly adv.. -unpleasantness n.

unreserved adj. without limits or reservations 無限制的，無保留的；充分的；坦白的

unrest n. 不安；騷動

unsold adj. 未銷售的

unsuccessful adj. 不成功的；失敗的

until also till(亦作till)- prep.& conj. up to the time when, up to as late as 直到…為止;在…以前

not…until… 直到．．．．．．之前；不到．．．．．．(不)

unusual adj. not usual; rare; not common; interesting because different from others 不平常的；罕見的；與眾不同的；獨特的

up adv. 1 from below towards a higher place; away from the floor, the ground, or the bottom 向上；向更高處；離開樓面(地面，底部)

2 in a high place 在上；在高處

3 into an upright or raised position 趨向直立或豎起姿勢

adj. 1 directed or going up 向上的

2 (of a road )being repaired (道路)正在修理的

prep. 1 to or in a higher place in; upwards by way of 向．．．面; ;在．．．上面；由．．．向 上

2 along; to or at the far end of 沿著；向．．．的遠端；在．．．的遠端

3 against the direction of(the current of a river) 逆著(河流)的方向 (＜反＞down)

4 up and down:

a. higher and lower on 沿．．．上(去)下(來)

b. backwards and forwards along 沿．．．來 回

upon prep. 在．．．．．．上面

upstairs adv.& adj. at, to, or on the upper floor(s) of a building 在樓上(的)；往樓上(的)

upwards also upward AmE(亦作upward <美>)- adv.

1 going up 向上，上升

2 with a particular side facing up (某一面)朝上地

uranium n. a heavy white metal that is a simple substance(element)

and gives out radioactivity 鈾(放射性元素)

us pron. (object form of WE) (WE的賓格)

use n. 1 the act of using or state of being used 用；使用；應(yīng)用；利用

2 the ability or right to use something 運用能力；使用權(quán)

3 the purpose or reason for using something 使用目的；用途；用處

4 the usefulness or advantage given by something 效用；好處；價值

use v. used, using 1 to employ for a purpose; put to use 用；使用；利用；應(yīng) 用

2to finish; consume 消費；消耗；耗盡

3 derog (貶)to treat (someone) with consideration only for one’s own advantage(為私人利益)利用(他人)；自私地對待(某人)

v. used, BrE negative short forms usedn’t, usen’t (<英>否定縮略形式 usedn’t, usen’t )

(used in the past tense only, to show that something happened always or regularly)(僅用于過去式中，表示某事過去經(jīng)�；蛴幸�(guī)律地發(fā)生)

make use of 利用；借用

use one’s head 動腦筋；仔細考慮

USAGE 1 Used to and would are both used of things that happened always or regularly in the past, but would is not used at the beginning of a story用法: Used to和would 都用以表

示事物過去經(jīng)�；蛴幸�(guī)律地發(fā)生，但在開始敘述時不用would: We used to swim ev.ery day

When we were children. We would run down to the lake and jump in… 我們小時候天天去游泳。我們常跑到湖邊，跳進水里．．．

2 The usual question form of used to is Did(n’t)

sl: use/used to, but Used/Usen’t she to are also possible. used to 的常用疑問形式是

Did(n’t)she use/used to, 但也可用Used/Usen’t she to. in the NEGATIVE, She used not to/usen’t to and She didn’t used/use to are all possible, but She never used to, which expresses the same idea, is probably more common. 在否定句中，She used not to/usen’t to 和She didn’t used/use to 兩者都可用，但意思相同的She never used to 也許用得更為普遍

used 動詞use的過去式

used to 過去常常

be used to 習慣于

useful adj. 1 effective in use 有用的；有效的；有益的 2 helpful 有幫助的

useless adj. not of any use 無用的；無效的；無益的

–uselessly adv.

–uselessness n.

usual adj. happening most often; customary 通常的，平常的，慣常的

as usual as generally has happened before 象往常一樣；照例

usually adv. often; generally 通常，經(jīng)常，慣常

　V

vacation [v 'kei n] n. A time of rest, amusement, and recreation away from one's job or school Am. E 假期，休假

syn. holiday Am. E 可指傳統(tǒng)節(jié)日，也可泛指休息日，常用復數(shù)表示長時間休息

leave 因事，因病請假

valley ['v li] n. The land lying between two lines of hills or mountains 山谷，河谷

various [v' ri s] adj. different; several, number of 各種各樣的，不一樣的

variously, variety, vary

ant. different 不同的，不一樣的

valuable ['v ljuble] adj. 1. worth a lot of money 貴重的，值錢的

3. a piece of furniture, storage apparatus, etc., which can be fitted with others of the same type 一套用具(如家具、貯藏用具等)

unite v. 1. to join together into one (使)聯(lián)合；(使)團結(jié)；(使)合并

2. an amount or quantity taken as a standard of measurement (作為計數(shù)或計量標準的)單位

3. a club or society, esp. a TRADE UNION 協(xié)會；聯(lián)合會；(尤指)工會

unit n. 1. a thing or group regarded as being a complete whole 單位；單元(指被視作一個整體的事物或團體)

2. (often cap.) (常大寫) a group of countries or states joined together 聯(lián)邦；聯(lián)盟

3. unnatural 非自然的；反常的；怪異的

uniform n. a certain type of clothing which all members of a group wear, esp. in the army, a school, or the police(尤指軍人，學生，或警察的)制服

union n. 1. the act of joining or state of being joined into one 聯(lián)合；合并；結(jié)合

2. not likely to give good health 對健康不利的；對身心有害的

2. to make or become clear, more fully known, etc. 顯露，表露

unhealthy adj. 1. not generally in good health 不健康的；有病的

3. fml or polite(正式；雅) to have been informed; have found out(a fact) 獲悉；得知；發(fā)覺

understanding n. the act of understanding; power to judge 理解，了解，領(lǐng)會；理解力，判斷力

underwater adj.& adv. (used, done, etc.) below the surface of the water 在水下的，在水中(使用，進行)的；在水下，在水中(使用，進行)

undivided adj. complete 完整的，未分割的；專一的

unfair adj. 不公平的;不公正的

unfold v. 1. to open from a folded position 展開，攤開，打開