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BNC: 27913 COCA: 15780

acuity

a·cu·i·ty /əˈkjuːəti/ noun [uncountableU] formal  
the ability to think, see, or hear clearly 敏捷,敏锐,灵敏
 A motorist needs good visual acuity.
驾车者需要良好的视敏度。
Examples from the Corpus
Origin acuity
(1500-1600) French acuité, from Old French, from agu sharp, from Latin acutus; → ACUTE
a·cu·i·ty noun
Chinese
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