Ladder 梯子
It needs to be leaned against a wall for support. 它需要靠在墻上支撐
Stepladder / Step ladder 折疊梯
Two ladders joined together at the top with a hinge. 鉸鏈把兩個梯子的頂部鏈接在一起
Stairs 樓梯
A set of steps built between two floors inside a building. 在建築物内的兩層樓之間所建造的一組臺階
Steps 臺階
A set of steps that are outside of a building. 建築物外的一組臺階
Escalator 自動手扶梯
a power-driven set of stairs arranged like an endless belt that ascend or descend continuously 一組由動力驅動的樓梯，由一條環形帶不斷操作其上升或下降。
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