U字開(kāi)頭的單詞或詞組
upon my worduncharteduninhabitedunsettlingupper lipudderunreadupheavalunheard-ofunpackedunwaryunreadableU-tubeunder the guidance of...ule-unbreakableuntoldunrecordedunflinchingup one's streetundyinguntappedunattendedundrawUMButility powerunderreportupset stomachunbeatableunmaskundeservedunfeasibleUtopianundisputedunder footunproductiveunsteadilyup the riverunderrateunceasinguprisingunfruitful