U字開頭的單詞或詞組
underachieverunderachieveUCCunrecoverable errorunlinedupholsteruneditedunallocateduniversalizeundilutedung.underliningunformatUBUFIunopenedunder one's noseunaided eyeuninviteduser profileup to no gooduremiaunhorseultranationalistunfetteruniversal timeunboundeduncivilunconsiousup to muchundecidedunderplayunalienableuniform distributionundisclosedup and aboutunerringundefined labelungrudgingunmanuplinkurinal