0 a type of service available on the internet that allows you to exchange written messages with someone else who is using the service at the same time --
1 a service available on the internet that allows you to exchange written messages very quickly with someone who is using the internet at the same time: --
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.