twenty-twenty

Word family nountwentiestwentyfoldtwenty-onetwentyadjectivetwentiethtwentyishtwenty-twenty

ˌtwenty-ˈtwenty, 20/20 noun [uncountableU]

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 feet

词汇	twenty-twenty
释义	twenty-twenty Word family nountwentiestwentyfoldtwenty-onetwentyadjectivetwentiethtwentyishtwenty-twenty ˌtwenty-ˈtwenty, 20/20 noun [uncountableU] 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 feet
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