单词	twenty-twenty
释义	twenty-twentyˌtwenty-ˈtwenty, 20/20 noun [uncountable] Word Origin WORD ORIGINtwenty-twenty Origin: 1800-1900 From normal sight being judged on the ability to read letters at a distance of 20 feet Phrases PHRASES FROM THE ENTRY► twenty-twenty vision I hope that the account that follows will seem straight forward-but it is written with the twenty-twenty vision of hindsight. ► twenty-twenty hindsight 1 twenty-twenty vision the ability to see things normally, without needing glasses:  A pilot must have twenty-twenty vision.2twenty-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
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