U字開頭的單詞或詞組
uneducatedunfavorableupdate nowunpretentiousundefined variableunisexuncannyunfavourableunwantedunconcernedunsettledunbalancedUCLunavoidableuninhibitedunbalanceunknowinglyuntamedundercutUNIXunder one's belturic acidUruguayundertakerunreflectinguserinfoU.S.S.R.unambiguousunconditionalupwardunkindunregisteredunnamedunfathomableunofficialundertookundisturbedupturnunresolvedutility functionunbiasedurethane