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twenty-twenty 或 20/20 AHD[twĕnʹtē-twĕnʹtē, twŭnʹtē-twŭnʹtē] D.J.[ˈtwentiːˈtwentiː, ˈtwʌntiːˈtwʌntiː]K.K.[ˈtwɛntiˈtwɛnti, ˈtwʌntiˈtwʌnti]adj.（形容词）- Having normal visual acuity.视力正常的
- [From a method of testing vision by reading charts at a distance of 20 feet] [源于在距离20英尺处读视力表的一种测视力方法]
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