U字母开头的单词或词组(第7页)：

• universal
• universe
• unless
• until
• unusual
• up
• up-to-date
• upon
• upper
• upset
• upward
• urban
• urge
• us
• usage
• use
• used
• useful
• useless
• usual
• utmost
• ugly
• ulcer
• ultimate
• umbrage
• umpire
• unaffected
• unbecoming
• unanimous
• unassuming
• unbend
• uncanny
• uncommitted
• unconscionable
• unconscious
• unctuous
• underbid
• undercut
• uncouth
• underdog
• underscore
• undermine
• underhanded
• undergird