0 a chemical element that is a radioactive gas formed when radium decays and found naturally in rock and soil: --
1 a colorless radioactive gas that is formed when radium (= a chemical element) and some other substances break down --
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.