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urgency
The need for quick action or attention.
urgent
緊急的，急迫的
urgently
緊急地
urgh
An expression of annoyance or disgust.
URI
a string that identifies a resource on the web.
uric
relating to a waste substance found in urine
urinary
relating to the organs that produce liquid body waste
urination
the act of releasing liquid waste from the body.
urine
尿液
URLs
Addresses for websites on the internet.
urn
decorative vase for holding ashes
urology
medical study of the kidneys and bladder
Ursa
A constellation named after a bear.
Uruguayan
related to Uruguay or its people.
usability
How easy something is to operate or understand.
usable
in good enough condition to function
USAF
abbreviation for the United States Air Force.
usage
（詞語或語言的）用法
USAID
U.S. agency for international development.
USDA
United States Department of Agriculture.
use
to employ something for a purpose
use a sledgehammer to crack a nut
use excessive force for a small problem
use in anger
To use something in a real situation.
use it or lose it
If not practiced, a skill may fade away.