0 A building or other place that is impregnable is so strongly built and/or defended that it cannot be entered by force: --
1 so strongly made that it cannot be broken into or taken by force: --
an impregnable fortress
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.