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comprise
vt.①包含，包括 The Union comprises fifty states.美国有五十个州。②由……组成 The team is comprised of eleven members.一个队由11名成员组成。③构成，组成 Fifty states comprise the Union.五十个州组成美国。
conceal
vt.~ sth./sb.(from sb./sth.) 隐藏He concealed his real motives from me.他对我隐瞒了他的真实动机。
真题例句：Their birth parents often try to conceal their birth information。
译文：他们亲生父母往往试图隐瞒其出生的资料。
concede
vt.~ sth.(to sb.) 承认;承认失败;允许(他人)得到 I concede that you are right.我承认你是对的。vi.让步He had to concede.他只好让步。
真题例句：Even exercise professionals concede half a point here.
译文：甚至体能专业教练也会在这点上退让半步。
concern
n.①关切的事，有关的事②关心，忧虑，焦虑public concern about/over/with corruption 公众对于一个腐败现象的忧虑parents’ loving concern for their children父母对孩子的关爱 ③对某人来说是感兴趣的事物，关联It’s no concern of mine.这事与我无关。④公司，企业a huge industrial concern 巨大的工业企业vt.①涉及，关于②使关心，使担心
as/so far as…be concerned就……而言
真题例句：They concern a small number of people only.
译文：他们只关注少数的人。
concerning
prep.关于 They show great anxiety concerning their retirement allowance.他们对自己的养老金问题显得十分焦虑。
真题例句：Readers turn naturally to books because their curiosity concerning all manners of things, their eagerness to share in the experiences of others and their need to escape from their own limited environment.
译文：读者很自然地转向书籍，因为他们对各种事物存有好奇心，他们渴望分享他人的经验，他们需要摆脱自己有限的环境。
concession
n.让步，特许，特许权，承认make some concession in price在价格上做些让步;a concession to her inexperience体谅她缺乏经验
concentrate
vi.&vt.①全神贯注，全力以赴 We must concentrate our efforts on improving education.我们必须致力于改进教育工作。②集中，聚集 concentrate on/upon 集中，中心Our population is concentrated in the big cities.我国人口集中在大城市里。③浓缩 n.浓缩物，浓缩液
真题例句：We should concentrate on sharply reducing interest rates to pull the economy out of recession.
译文：我们应该集中精力大幅降低利率，以拉动经济走出衰退。
辨析concentrate focus
这两个动词均有“集中，聚集”之意。都可以与介词on搭配。
①concentrate 指把人或物集中在一起，也可指把精力或注意力集中于某一事物上。
②focus 侧重指把光、热、射线等集中于一点，也可指把思想或精力等集中于某人或某事情上。
constant
a.经常的，不断的，连续发生的;永恒的
真题例句：Guidelines for preparing a resume are constantly changing.
译文：简历写作指南一直在不断地更新。
adj. 全神贯注的，浓缩的 动词concentrate
