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twenty-twenty的英文翻译是什么意思，词典释义与在线翻译：
英英释义
Noun:
-
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...
