Stories of USA Today
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 4000 Duolingo (U - Z) - Spelling Practices
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a. 不能架桥的,不能逾越的 impassable; unable to be bridged or crossed; impossible to span


Spelling Word: unbridgeable
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v. 强调 draw a mark or line under; emphasize; stress


Spelling Word: underscore
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ad. 不平坦地,不均衡地 irregularly; in an unequal or partial manner


Spelling Word: unevenly
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a. 令人不满意的 not giving satisfaction;  inadequate


Spelling Word: unsatisfactory
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ad. 不合时令地,不合时宜地 not in accordance with the season


Spelling Word: unseasonably
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n. 空白,空缺 space or place that is available to be used; emptiness


Spelling Word: vacancy
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n. 活门,阀 device or structure for controlling the flow of a fluid


Spelling Word: valve
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ad. 经由,途经,通过,凭藉 by the way of


Spelling Word: via
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n. 暴力,强暴 the physical force exerted to violate, damage, or abuse


Spelling Word: violence
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n. 视觉 ability to see; sight; the vivid mental image


Spelling Word: vision