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Stairs are made out of lots of steps that you can climb to get somewhere higher. If you are in a tall building or a double storey house there will be a staircase so you can get to the next floor up.
If a building has too many floors for someone to walk all the way up without getting tired, it will have an elevator or lift to take you to another floor.
If a building has too many floors for someone to walk all the way up without getting tired, it will have an elevator or lift to take you to another floor.