U字開頭的單詞或詞組
unconstrainedunclaimedundulyubiquinoneunit costunrivaledunderdevelopedunintendedunmistakableunderdounwieldyunwittingunit typeUDPGundernourishUTPumbraup rununhingeunforeseenunwrittenuncookedunfurlunder the pressure ofunorthodoxupper jawunmarriedUlan Batorunanimityunmeeturinary bladderundernourishedunilateralunitary stateunder-representedunforgivableunhurtunthinkableunstatedunderwriterunconnectedunfreeze