0 a show of the work an artist has done in their life so far: --
a Hockney retrospective/a retrospective of Hockney's work
2 looking back over the past: --
3 if a law, decision, etc. is retrospective, it has effect from a date in the past before it was approved: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.