The pronunciation of the ladder is tι, a pictophonetic character. From the wood, brother's voice. Original intention: an instrument or equipment (especially a building) that is convenient for people to climb up and down. The word "ladder" and its meaning are as follows:

1, stairs

Used for traffic contact between floors and when the height difference is large. Multi-storey and high-rise buildings with elevators and escalators as the main vertical means of transportation should also be equipped with stairs. Although elevators are the main vertical means of transportation in high-rise buildings, stairs should still be reserved for escape in case of fire.

2. Elevator

Permanent transport equipment serving several specific floors in a building, whose vehicles run on at least two rigid tracks perpendicular to the horizontal plane or with an inclination angle less than15. There is also a step, the pedal is installed on the track and runs continuously, commonly known as escalator or moving sidewalk.

Third step

Steps and ladders; Metaphor means to enter the body by means of or. Tagore famously said, "Grumpy is one of the meaner natures of human beings. When a person loses his temper, he will take a step backwards on the ladder of human progress. "

4. Class

Echelon refers to people who used ladders to draw walls when attacking cities in ancient times. In military language, the names of brigade, squadron and detachment are clearly defined, for example, squadron is equivalent to a company.

5. Slides

It belongs to comprehensive sports equipment and can only be used for slide activities by climbing. Children need firm will and confidence to play slides, which can cultivate their brave spirit. When the child slides down, he can enjoy the joy of success.

Baidu encyclopedia-ladder