2.　 an amount or quantity taken as a standard of measurement (作为计数或计量标准的)单位

3.　 a club or society, esp. a TRADE UNION　 协会；联合会；(尤指)工会

unit　 n.　 1. 　a thing or group regarded as being a complete whole 单位；单元(指被视作一个整体的事物或团体)

2. (often cap.) (常大写) a group of countries or states joined together 联邦；联盟

3. 　unnatural 非自然的；反常的；怪异的

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

union　 n. 　1.　 the act of joining or state of being joined into one 联合；合并；结合

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

2.　 to make or become clear, more fully known, etc. 显露，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) 获悉；得知；发觉

understanding　 n.　 the act of understanding; power to judge 理解，了解，领会；理解力，判断力

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

undivided　 adj.　 complete 完整的，未分割的；专一的

unfair　 adj. 　不公平的;不公正的

unfold　 v. 　1.　 to open from a folded position 展开，摊开，打开

2. to know or feel closely the nature of (a person, feelings, etc.) 领会，了解(人，感情等)

3.　 working for; controlled by 为．．．工作；受．．．支配

underground　 also tube BrE; subway AmE　 n.　 a railway system in which the trains run in passages under the surface of the ground 地下铁道

understand　 v.　 1. to know or get the meaning of (something) 懂；理解；明白

2. 　less than;

syn. below 少于；低于；在．．．以下

ant. over