U字開頭的單詞或詞組
usurpunrulyup forunderageunmatchedunreflectinguncannyundercutUFPuneducatedUNIXunfavorableunsettledunavoidableunbalanceupdate nowuric acidunwantedundefined variableundisturbedunfavourableUruguayunbalanceduninhibitedundertakerunambiguousunder one's beltUCLunknowinglyuserinfoU.S.S.R.unnameduncoveredupwardunconditionalunregisteredupper caseundervalueundertookunfathomableunkindunloading