upstairs
upstairs/ʌpˈstɛəz/ I.adv.在楼上，往楼上：sleep upstairs睡在楼上；go upstairs上楼The bedrooms are upstairs.卧室在楼上。‖II.adj.(后面的“s”可要可不要)楼上的：an upstairs room一···
up-to-date
up-to-date/ˌʌptəˈdeit/adj.1.现代化的，最新的：up-to-date style最新款式；up-to-date equipment现代化设备2.跟上时代的：His thought isn’t up-to-date.他思想跟不上时代。
upward
upward/ˈʌpwəd/ I.adj.向上的：an upward glance向上的一瞥；an upward tendency向上的趋势‖II.adv.(-s)向上，往上，…以上：shoot upwards向上射去；children of five years and upwards 5···
uranium
uranium/juəˈreiniəm/n.［u］铀：uranium enrichment铀浓缩；high-enriched uranium (HEU)高浓(缩度)铀They went over nationwide in search of uranium mines.他们为了探寻铀矿走遍了全国。
urban
urban/ˈə:bən/adj.城市的，都市的：urban districts(life)市区（都市生活）；urban inhabitants城市居民；the urban poor城市贫民；the urban population城市人口Traffic is a major urban p···
urge/urgency/urgent
urge/ə:dʒ/ I.n.［c］强烈的欲望，迫切的要求：have an urge to travel有去旅行的强烈欲望；control one’s sexual urges控制性欲‖II.vt.驱策，鼓励；催促，力劝：urge a person’s study鼓励···
urine
urine/ˈjuərin/n.［u］小便：pass urine撒尿；urinesample/specimen尿样；sugars in urine尿糖He said he leaked urine when he coughed.他说他咳嗽时遗尿。These wastes are finally elimina···
us
us/ʌs, əs/pron.我们(宾格，主要用作宾语，在口语中也可用作表语)：Who’ll teach us maths?谁教我们数学? It’s us.那是我们。We asked him to come with us.我们请他同往。They are richer ···
usage
usage/ˈju:zidʒ, ˈju:sidʒ/n.1.［c］&［u］惯用法，习语: modern English usage现代英语惯用法That phrase has come into (gone out of) usage.那短语已为(已不再为)大家惯用2.［u］使用···
use/useful/useless/user
useI. /ju:z/vt.1.使用，运用：You can use it as/for a bookmark.你可以用它当书签。People use bricks to build houses.人们用砖盖房子。It is widely used.它被广泛应用。2.消耗，用掉：Larg···
