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• understand
• unclothe
• um
• upload
• update
• unjustifiable
• unify
• urgent
• upon
• undress
• undertaking
• unbind
• untouched
• unwise
• undying
• untrue
• uncommon
• underwater
• upset
• undoubted
• unification
• uncertainty
• unintelligible
• uneven
• umbrella
• urgency
• urbanize
• urban
• unmeaning
• underling
• unrelated
• uninviting
• untrustworthy
• unfold
• unite
• uptown
• unaccustomed
• up
• ultimatum
• uprise
• undivided
• unusual
• utopian
• usage
• unmindful
• ultramarine
• upstage
• uranium
• utility
• untangle
• unit
• unique
• until
• utopia
• unchaste
• unsuccessful
• upper
• umpire
• unconditional
• unstable
• ultimate
• used
• unguided
• undergraduate
• utilization
• uncongenial
• underground
• unforgivable
• undo
• unethical
• unlawful
• unfit
• ungoverned
• unconquerable
• unready
• unravel
• urbane
• understandable
• unlucky
• upgrade
• UV
• unsatisfied
• Ural
• uppermost
• usurer
• undistinguished
• unthinkable
• unilateral
• unceasing
• up-to-date
• unpardonable
• unassuming
• undue
• undetermined
• unconcerned
• unobtrusive
• universal
• unrepentant
• unconstitutional
• unskilled
• unpunctual
• unassailable
• unzip
• unconformity
• uproarious
• underestimate
• ugly
• unprotected
• utmost
• unimportant
• unfailing
• uterine
• unsuspecting
• unskillful
• united
• unfinished
• Unix
• unpremeditated
• unfaithful
• uninfluenced

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因篇幅关系，字母U开头的单词只列出前 120 个；字母U开头的英语单词由君君词典提供查询