0 a tube or pipe that carries liquid or air, especially in and out of buildings or through the body -- conducto
1 a tube or pipe for fluids etc -- conducto
a ventilation duct
a tear duct.
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.