8339.upbringing(名)教养
After a very proper upbringing, he chose to lead the Bohemian life of an artist．
他受过正统的教育，却立志过着艺术家我行我素的生活。

8340.upgrade(动)升级
Organizations may suddenly need to upgrade servers．
各单位可能突然会需要对服务器升级。

8341.uphold(动)支持
同义词support
Eight columns uphold the big dome．
8根柱子支撑着这个大圆顶。

8342.uplift(动)振奋、鼓舞
His soul was uplifted by the music.
音乐使他的精神振奋了起来。

8343.uproot(动)根除
Windows were broken and large trees were uprooted．
窗被打碎，大树被连根拔起。

8344.uranium(名)铀
The isotope of uranium with mass number 235，had fission with slow neutrons．
铀的同位素，原子质量数为235，与慢中子发生裂变。

8345.urine(名)尿
When was the urine sample collected?
尿样本是什么时候收集的？

8346.utensil(名)用具
This store sells cooking utensils.
这商店出售炊具。

8347.utility(名)效用、实用
The store deals in objects of domestic utility.
那家商店出售家庭用品。

8348.utilize(动)利用
Scientists are trying to find more efficient ways of utilizing solar energy．
科学家正在寻找能更有效地利用太阳能的方法。

8349.vaccinate(动)给……接种
后接介词against
Has your child been vaccinated against smallpox?
你的小孩接种牛痘疫苗了吗？

8350.vaccine(名)疫苗
Salk vaccine is a "killed" vaccine．
沙克疫苗是一种不会传染的疫苗。

8351.vacuum(名)真空
We could not pull apart two plates which enclosed a vacuum．
如果两个盘子间是真空，我们就无法将它们分开。

8352.vague(形)模糊的
Everything looked vague in the heavy fog．
在浓雾中，一切东西看起来都很模糊。

8353.vaguely(副)模糊地
I vaguely remember their house.
我依稀记得他们的房子。

8354.valid(形)有效的
同义词effective
The ticket is valid for one month.
这张票在一个月内是有效的。

8355.validity(名)正当、确实
We should question the validity of those figures．
我们应当查询那些数字的正确性。

8356.valve(名)阀、活门
The exhaust valve on my car has burnt out three times．
我车子上的排气阀已烧坏三次了。

8357.vanity(名)虚荣心
He did that to gratify his girlfriend's vanity．
他做那事是要满足他女友的虚荣心。

8358.vanquish(动)击败
Government troops have vanquished the rebels.
政府军已经击败了叛乱分子。

8359.vapor(名)蒸气
A cloud is a mass of vapor in the sky．
云是天空中的一团水气。

8360.velocity(名)速度
The velocity of light is about 186OOO miles per second．
光速大约是每秒十八万六千英里。

8361.vengeance(名)报仇
Herbert swore vengeance on the murderers of his father．
赫伯特发誓要向谋杀他父亲的凶手们报仇。

8362.verdict(名)裁定
The jury brought in a verdict of guilty．
陪审团裁定有罪。

8363.vertical(形)垂直的
The northern side of the mountain is almost vertical.
这座山的北侧几乎是垂直的。

8364.vessel(名)容器
Cups,basins, pots,bottles, casks, etc, are vessels that hold liquids.
杯、盆、罐、瓶、桶等都是盛液体的容器。

8365.veteran(名)老兵
John was a veteran of many battles.
约翰是个身经百战的老兵。

8366.veto(名)否决权；禁止
The Presidpnt threatened to use his veto over the bill.
总统威胁要对这个议案行使否决权。

8367.vibration(名)振动
Your finger can feel the vibration on the violin string.
你的手能感觉到小提琴琴弦的振动。

8368.vicinity(名)附近
There is no high school in the vicinity.
这附近没有高中。

8369.vicious(形)恶毒的
I won't listen to such vicious remarks．
我不想听这种恶毒的话。

8370.victim(名)牺牲者
The victims of the explosion were buried last week．
爆炸事故的牺牲者于上周举行了葬礼。

8371.victimize(动)使痛苦
I was victimized the whole evening by his loquacity.
整个晚上他的吵闹不休都使我痛苦不已。

8372.vigor(名)活力
The leader of the expedition must be a man of great vigor.
探险队的负责人必须是有活力的人。

8373.vigorous(形)精力充肺的
The nest held three vigorous young birds.
这窝里有三只精力充沛的小鸟。