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twenty-twenty的英文翻譯是什么意思，詞典釋義與在線翻譯：
英英釋義
Noun:
-
normal visual acuity, as measured by the ability to read charts at a distance of 20 feet
twenty-twenty的用法和樣例：
詞匯搭配
- twenty-twenty vision 〈醫〉正常視力...
- twenty-foot equivalent unit 二十英尺當量單位...
- twenty five (=25) 二十五
- twenty pin 中二十箭的優秀別針...
