U字开头的单词或词组
uppercaseuniversalityunreachableunethicalundounanimouslyutmostunloadunderlieur-uglifyuprightunwaveringunemploymentunusuallyunnecessaryurethraundeniableU.N.Utopiauplifturge sb to do sthURLunwiseunpleasantunder the tableutiliseunclearunearned revenueup and downU.S.urethralutauniversal grammarunder fireup frontunacceptableusherunderstoodunanimousupbringingunrealistic
