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ultimate  | 
        
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a. 终极的 final; being the last or concluding; fundamental; elemental; extreme As the ultimate arbiter of the Constitution, the Supreme Court occupies a central place in our government scheme.  | 
        
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ultimatum  | 
        
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n. 最后通牒 last offer; final statement of terms made by one party to another He said it was a warning, not an ultimatum, aimed only at the capital's bandits.  | 
        
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unadorned  | 
        
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a. 未装饰的,朴实的 without adornment; simple or plain; not admirable She referred to an unadorned rectangular stone, perhaps two meters wide and three long, strangely scarred in places.  | 
        
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unanimous  | 
        
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a. 全体意见一致的 uniform; in complete agreement At last, we got the unanimous decision.  | 
        
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unbearable  | 
        
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a. 无法忍受的,承受不住的 unendurable; so unpleasant, distasteful, or painful as to be intolerable I wouldn't be sitting there because I'm in unbearable pain.  | 
        
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unbridgeable  | 
        
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a. 不能架桥的,不能逾越的 impassable; unable to be bridged or crossed; impossible to span It is a broad, unbridgeable river.  | 
        
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unconditional  | 
        
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a. 无条件的,无限制的,绝对的 made without condition; absolute; unreserved He closed his eyes for a moment, wondering what it would be like to have that kind of unconditional love and support.  | 
        
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unconventional  | 
        
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a. 非传统的 not conforming to accepted rules or standards The mother's unconventional behavior also raised many conservative eyebrows.  | 
        
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unconvincing  | 
        
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a. 不足以令人相信的 not such as to convince or to impress seriously Sorry – but this is unconvincing from a moral or strategic point of view.  | 
        
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uncover  | 
        
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v. 发现,揭示 remove the cover from; expose; disclose We could have Mandarin uncover some secret, magical thing which makes him powerful.  | 
        
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underestimate  | 
        
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v. 低估,看轻 make too low an estimate of the quantity; undervalue One thing I think you underestimate is how much in the minority you are.  | 
        
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undergo  | 
        
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v. 经历,遭受 experience; suffer; pass through In February, a court ruled that Mr. Doe should undergo a DNA test.  | 
        
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underground  | 
        
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a. 地下的,地面下的 under the level of the ground; buried I speak with several years of experience actually working in underground mines.  | 
        
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underlying  | 
        
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a. 根本的,在下面的,潜在的 lying under or beneath something; basic; implicit; taking precedence; prior We face a combination of changes in underlying conditions not seen in almost a century.  | 
        
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underscore  | 
        
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v. 强调 draw a mark or line under; emphasize; stress Addressing the jogging class, Kim would underscore the importance to runners of good nutrition.  |