U字開頭的單詞或詞組
unaffectedulnaruncloudedunderdressunpickunflatteringunit numberusual practiceunobtrusiveup-and-downunburdenup in the airundercurrenturacilunderwriteup onup to parUnion of Soviet Socialist Republicsunattractiveundockuniversal machineupdate informationuntrustworthyubiquinoneunrivaleduveitisUDPGupholsteryundividedunderwritingunadjustedupliftedultrasonographyUMAunit costunderdounwieldyunsetunstructuredundetectedunintendedunwritten