0 a unit that has the same value as the force produced by 1,000,000 tons of TNT (= an explosive), used for measuring the power of explosions, especially nuclear explosions -- megatón
1 (of a bomb) giving an explosion as great as that of a million tons of TNT -- megatón
a five-megaton bomb.
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.