0 not spoiled or made weaker by the addition of other substances; pure -- no adulterado, auténtico, puro
People injecting drugs can never be sure that they’re using unadulterated substances.
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.