0 small pieces of metal that fly through the air when a bomb or similar weapon explodes and are intended to injure people -- metralla
1 small pieces of metal from an explosive shell, bomb etc -- metralla
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.
Podemos completarlo paso a paso, por muy largo que sea el camino, y no se puede completar, por corto que sea el camino, si ni siquiera marcas tu huella.