0 a piece of equipment that can be connected to a computer to give it an extra use: --
3 something extra that is added to a product to make it better: --
4 a piece of computer equipment or software that is added to a computer so that the computer can do more or different things: --
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.