U字開(kāi)頭的單詞或詞組
UGTup in armsuberutensilundertakinguneaseunevenULSIungratefulunboundureterusanceunspoiltuser nameunsupervisedunsuspecteduncoolunderstateundeclareduntouchableuglinessunsettleunderpaidunlearnuphelduttereruraniumUnivacunder the sununabridgedU.s. dollaruninterestingunrestricteduncontrollableuntolduser friendlyuser interfaceunannouncedunequaledunwellunder sealundress