twenty-twenty adjective
or 20/20 /ˈtwɛntiˈtwɛnti/ or 20/20 /ˈtwɛntiˈtwɛnti/ Learner's definition of TWENTY-TWENTY
: having good vision and able to see without glasses视力绝好的
twenty-twenty hindsight
or 20/20 hindsight
: the full knowledge and complete understanding that you have about an event only after it has happened事后聪明;事后的认识