9584.turbulence(名)湍流、亂流
The pilot announced that there was some turbulence ahead．
駕駛員預(yù)告說(shuō)前方有亂流。

9585.turbulent(形)騷動(dòng)的、騷亂的、動(dòng)蕩的；洶涌的
The current is turbulent.
水勢(shì)洶涌。

9586.tumover(名)人員更替數(shù)、人員更換率
不可數(shù)
Why does your company have such a rapid turnover of staff?
貴公司人員變動(dòng)為什么這么快？

9587.tutorial(形)個(gè)別指導(dǎo)的、家庭教師的；輔導(dǎo)的
With the increased number of students,it is quite usual for two or more students to attend a tutorial class together.
學(xué)生人數(shù)增多，兩個(gè)或更多的學(xué)生一起上輔導(dǎo)課已是司空見(jiàn)慣。

9588.ultimatum(名)最后通牒
An ultimatum has been issued to him to with draw his troops from our territory.
向他提出的最后通牒是要求他把部隊(duì)撤出我國(guó)領(lǐng)土。

9589.unassuming(形)謙虛的、不出風(fēng)頭的；保守的
I believe that a simple and unassuming life is good for everybody,physically and mentally.
我認(rèn)為簡(jiǎn)單樸素、不張揚(yáng)的生活方式對(duì)任何人的身心都有好處。

9590.unconventional(形)不符合習(xí)俗的、非常規(guī)的
His twin brother considered himself unconventional and original,so he set up as an artist．
他的孿生弟弟自以為卓然出眾而又有創(chuàng)作天賦，因而成為了一名畫(huà)家。

9591.undergraduate(名)大學(xué)生、大學(xué)肄業(yè)生
My brother is a Yale undergraduate.
我弟弟是耶魯大學(xué)的大學(xué)生。

9592.underwear(名)內(nèi)衣
單復(fù)數(shù)同形
She changes her underwear every day.
她每天換內(nèi)衣。

9593.undulating(形)波浪起伏的、波動(dòng)的
Their encircling and undulating movement contrasts pleasurably with the straight trunks of erect trees.
它們那種盤(pán)繞和波動(dòng)的線條，和樹(shù)木挺直的軀干形成了有趣的對(duì)比。

9594.unemployment(名)失業(yè)、失業(yè)狀態(tài)
不可數(shù)
Miiilons of people were thrown into unemployment.
數(shù)百萬(wàn)人被迫失業(yè)。

9595.unfathomable(形)深不可測(cè)的、不可理解的
No more can I look into the depths of this unfathomable water.
我再也無(wú)法窺探這深不可測(cè)的水域奧秘了。

9596.union(名)工會(huì)、聯(lián)盟、協(xié)會(huì)
He was compelled to join the union as a condition of getting the job．
獲得該工作的先決條件是他被迫加入了工會(huì)。

9597.unprecedented(形)無(wú)先例的、空前的
The rate of growth was unprecedented.
這個(gè)成長(zhǎng)率是前所未有的。

9598.unsound(形)不穩(wěn)固的、不安全的
That bridge looks unsound to me．
依我看來(lái)那座橋不安全。

9599.upbringing(名)養(yǎng)育、教養(yǎng)、培養(yǎng)
不可數(shù)
He owed his success to the good upbringing he had．
他的成功歸功于他受到的良好教養(yǎng)。

9600.upholstery(名)室內(nèi)裝潢品；室內(nèi)裝潢業(yè)
A sturdy ribbed fabric of wool,cotton,or wool and ootton,often with an embossed finish,are used for clothing and upholstery.
波紋織物是一種由羊毛、棉花和羊毛加棉花織成的結(jié)實(shí)織物，通常有凸起的圖飾，用于制衣和室內(nèi)裝飾。

9601.upstage(動(dòng))搶某人的戲、搶……鏡頭
He upstage the other speaker by illustrating his talk with slides.
他演講中配合幻燈片比其他演講人更吸引聽(tīng)眾。

9602.urban(形)都市的、城市的
同義詞metropolitan
In some developing countries more and more people are migrating to urban areas．
在某些發(fā)展中的國(guó)家，越來(lái)越多的人向市區(qū)遷移。

9603.utensil(名)器皿、用具
This store sells cooking utensils．
這商店出售炊具。

9604.utility(名)公用事業(yè)；公用事業(yè)公司
I found that I had forgotten to pay the bills for utilities．
我發(fā)現(xiàn)忘了付水電及瓦斯的費(fèi)用。

9605.vacancy(名)空缺、空職、空額
we have a vacancy for a computer programmer.
我們有一個(gè)電腦工程師的缺額。

9606.vaccine(名)牛痘苗、疫苗
This vaccine will give you immunity for two years.
接種這種疫苗可有兩年的免疫力。

9607.vain(形)愛(ài)慕虛榮的；自負(fù)的、炫耀的
She's very vain about her good looks.
她為他那姣好的容貌而自負(fù)。

9608.valley(名)山谷；流域
The valley lay before us.
那山谷呈現(xiàn)在我們眼前。

9609.vehicle(名)運(yùn)載工具；傳播媒介
Language is the vehicle of human thought.
語(yǔ)言是人類(lèi)表達(dá)思想的工具。

9610.vend(動(dòng))出售、販賣(mài)
Elle vends ice cream．
艾拉賑賣(mài)冰淇淋。

9611.venomous(形)有毒的、分泌毒液的、有毒腺的
同義詞toxic
A daddy longlegs spider is more venomous than a black widow, and it can open its mouth wide enough to bite a person．
成年長(zhǎng)腿蜘蛛的毒性比黑寡婦還要毒，而且它的嘴可以張大到足以咬住人。

9612.ventilation(名)通風(fēng)、空氣流通
不可數(shù)
They altered the house to improve its ventilation.
他們把房子裝修之后使它更通風(fēng)。