| 单词 | twenty-twenty |
| 释义 | ˌtwenty-ˈtwenty, 20/20 noun [uncountable] 1 twenty-twenty vision SEEthe ability to see things normally, without needing glasses 极好的视力；正常视力 A pilot must have twenty-twenty vision. 飞行员必须具有极好的视力。2. twenty-twenty hindsight used to say that it is easy to know what you should have done in a situation after it has happened, but you did not know what to do earlier 事后聪明，后见之明Origin twenty-twenty (1800-1900) From normal sight being judged on the ability to read letters at a distance of 20 feetˌtwenty-ˈtwenty nounChineseSyllable |
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