a·cu·i·ty
noun/əˈkjuːəti/
/əˈkjuːəti/
[uncountable] (formal)- the ability to think, see or hear clearly
（思维、视力、听力的）敏度，敏锐 - a child’s visual acuity
孩子的视力
Word Originlate Middle English: from Old French acuité or medieval Latin acuitas, from Latin acuere ‘sharpen’ from acus ‘needle’. - a child’s visual acuity