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| ultimatum | 
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| n.  (最後通牒) last offer; final statement of terms made by one party to another | 
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| undercharge | 
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| v.  (少要價錢,少算價錢) charge below or under; charge less than is usual or suitable | 
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| underlie | 
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| v.  (位於之下,成為基礎) be located under or below; be the support or basis of; account for | 
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| underlying | 
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| a. Syn. fundamental; implicit (根本的,在下面的,潛在的) lying under or beneath something; basic; implicit; taking precedence; prior | 
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| undermine | 
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| v. Syn. weaken (破壞) weaken by wearing away base or foundation; injure or impair; dig a mine or tunnel beneath | 
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| underwrite | 
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| v.  (認購,承購,承保,承擔) write under something else; subscribe; assume financial responsibility for; guarantee against failure | 
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| undoubtedly | 
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| ad. Syn. unquestionably; indubitably (毋庸置疑地,確鑿地) unquestionably; without doubt; certainly |