0 used to describe machines, etc. that do not need an outside energy supply to work as they have their own source of energy: --
They produce an intruder alarm system which is completely self-powered.
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.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.