The stairwell is the gap between the upper and lower running stairs, three stairs or four stairs in the middle of the square surrounded by a square space. The stairwell generally passes through the top floor from the bottom floor.
The middle part of the two ladder
That is, by the middle of the middle of the two handrails
The stairway is surrounded by stairs and the rest of the resting platform. Can be understood as the middle of the two ladder empty part, that is, by the middle of the middle of the two armrests empty part.Ladder is used for fire fighting, fire when the fire pipe from the ladder to the need to fire the floor.
