U字開頭的單詞或詞組
unrecognizableunhurtuniversal setunilateralunderwriterurbaneunmountedultimate strengthunderwoodulteriorunconquerableuncookedunjustifiableunlistedunderpinningunder-the-tableunidirectionalunnecessarilyunorthodoxunder one's breathUSIAunion cardunstatedunder house arrestuprootunknown characterunderpressureunder-unprotectedunlatchup inuseaunearthlyunavowedUsdaUIunmappedunnerveutility roomundesiredunity of commandunbridled