- unaided eye
- unbound hair
- under construction
- under favorable conditions
- under pressure
- under sb.'s directions
- up to
- Upper World
- upside down
- urban sprawl
- usher in
- ulterior
- ultimate
- ultimatum
- unanimity
- unanimous
- unassuming
- unattended
- unbiased
- unblemished
- uncanny
- uncouth
- undergo
- underline
- undermine
- undertake
- undertaking
- unearth
- unfair
- unfettered
- uniform
- unique
- universal
- unprecedented
- unruly
- unveil
- unwitting
- upbraid
- upbringing
- upgrade
- upheaval
- uphold
- upright
- uproar
- uproarious
- uproot
- upset
- urban
- urbane
- urge
- urgent
- usher
- usurp
- utensil
- utilitarian
- utility
- utilize
成人英语托福单词单词大全〔U 〕课程包含57个英语单词词汇。