undermine
underscore
undertake
undertaking
underwrite
undeterred
undue
unearth
unequivocally
uneven
unevenly
unification
uniform
uniformity;uniformly
uninitiated
unionization
unique
uniquely;uniqueness
unleavened
unobtrusive
unparalleled
unprecedented
precedent
unprocessed
unreimbursed
unscrupulous
unsubstantiated
untainted
untenable
unwarranted
unwieldy
updraft
upheaval
upheave
upholstered
upstate
upstream
upsurge
urbanize
urbanization
v.采取;接受;
n.事业
v.强调
v.破坏,削弱
adj.过度的,不适当的
adj.未受阻的
v.承诺支付;给…保险
adj.不规则的,不平坦的
adv.不均衡地
adv.不含糊地;明确地
v.出土
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