单词：twenty-twenty
音标：['twenti'twenti] ；
a. 视力正常的
n. normal visual acuity, as measured by the ability to read charts at a distance of 20 feet
twenty-twenty的用法和样例：
词汇搭配
- twenty-twenty vision〈医〉正常视力...
- twenty-foot equivalent unit二十英尺当量单位...
- twenty five(=25) 二十五
- twenty pin中二十箭的优秀别针...
【近义词】
- 20/20视力正常的