n.尖锐，（疾病的）剧烈，（视力、才智等的）敏锐,敏度
We work on improving visual acuity.
我们致力于提高视觉的敏锐度。
On examination, her visual acuity was normal and without apparent proptosis.
眼科学检查两眼大致正常.
This equates to increased and vigor, better sleep and sharper mental acuity.
也就是说可以起到增强活力, 改善睡眠,提高心智的作用.