U字開頭的單詞或詞組
unmistakableunwittingunit typeunfaithfulundulyunmeetunderdevelopedUTPunimpressedundernourishedunmarriedundernourishup rununder the pressure ofunhingeuglilyunmatchableunder-representedumbraU.S.A.unforeseenUlan Batorunforgivableunfurlurinary bladderunreasonablyunscrewunripeundercoatunconnectedupper jawunfreezeunclaimedubertyunbeliefunitary stateuninhabitableunconstrainedunthinkableunsightlyunderpassunanimity