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1.urine n.尿(waste material that is secreted by the kidney in vertebrates, is rich in end products of protein metabolism together with salts and pigments, and forms a clear amber and usually Slightly acid fluid in mammals but is semisolid in birds and reptiles)
同根词：urea（n.尿素）
2.utensil n．用具，器皿(implement)
词根记忆：ut（用）+ensil--用品--器皿
3.utilize v.利用，使用(to make use of)
词根记忆：ut(用)+ilize--利用
例：The system was originally utilized by the Chinese laborers who had preceded the Japanese.
派生词：utility(n．功用；[常pl.]公用事业)
4.vacant a．空着的，未占用的(empty)
词根记忆：vac(空)+ant（…的）--空着的
例：In any given day, one-fourth of all community beds are vacant.
派生词：vacancy(n．空闲；空缺)
5.vaccinate v.接种疫苗(to administer a vaccine to usually by injection)
例：Many parents would be more inclined to have their children vaccinated against influenza if the vaccination did not require an injection.
6.vaccination n.接神疫苗(the act of vaccinating)；牛痘疤(the scar left by vaccinating)
词根记忆：vaccin（牛痘）+ation--接种牛痘--接种疫苗
例：Many parents would be more inclined to have their children vaccinated against influenza if the vaccination did not require an injection.
7.vaccine n.牛痘苗，疫苗（a preparation of killed microorganisms, living attenuated organisms, or living fully virulent organisms that is administered to produce or artificially increase immunity to a particular disease)
词根记忆：vacc(牛)+ine--牛痘苗
例：The new vaccine uses the same mechanism to ward off influenza as injectable vaccines do.
8.vacuum n．真空(a space absolutely devoid of matter)
词根记忆：vacu(=vac空)+um--真空
例：Most astronomers believed that the space between the galaxies in our universe was a near perfect vacuum.//vacuum cleaners真空吸尘器
9.vague a．模糊的，含糊的(obscure)
词根记忆：vag(游移)+ue--游移不定的--模糊的
例：The confusing movie had a rather vague ending.
派生词：vaguely( ad.含糊地，不明确地)
