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United Arab Republic
United Fronts
United Irishmen，Society of
United Kingdom
United Nations
United Nations International Children’s Emergency Fund
United Provinces of the Netherlands
United States of America
unities
unit trust
Universal Decimal Classification
universal time
universe
universities
University of the Third Age
Unknown Warrior
unleaded Petrol
unlisted securities market
Upanishads
upas
Updike，John
Upolu
UpperVolta，Republic of
Uppsala
Ur
uraemia
Uralic Languages
Ural Mountains
Ural，River
Urania
uranium
uranium-lead dating
uranium series
Uranus
Uranus
Urartu
Urban Ⅱ
Urban Ⅵ
Urban Ⅶ
Urbino
Urdu
urea
urea-formaldehyde resins
urethane
urethritis
Urey，Harold Clayton
Urfa
Urfe，Honore d’
Urga
uric acid
urine
Urmia，Lake
Urnfield
Ursa Major
Ursa Minor
Ursula，St
Ursulines
urticaria
Uruguay，Oriental Republic of
Uruguay，River
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