U字母开头的单词或词组(第4页)：
- upside-down
- urbanize
- urgency
- urine
- urn
- usher
- utilization
- utterance
- utterly
- uttermost
- ultraviolet
- unbiased
- uncertainty
- unconventional
- underbrush
- undernourished
- undertaking
- underwriter
- undisturbed
- undone
- undoubted
- undoubtedly
- undress
- uneconomical
- uneven
- unemployed
- unfavorable
- unintentional
- United Kingdom
- United Nations
- unlawful
- unlicensed
- unlike
- unlikely
- unlimited
- undo
- united
- unity
- utility
- under the circumstances
- under way
- under control
- uncover
- up to date