sentence: Ladders have two vertical supports that go along the whole length of the ladder.
sentences_before: A 'ladder' is a tool which is made for people to climb up or down.
sentences_after: Between these supports are the horizontal rungs. The rung is what the climber can put his foot on. The climber can use his hands to hold on to the rungs above him, or to the supports at the side.
concept_name: ladder
headings: Ladder
categories: Tools Construction