escalator
/ˈeskəleɪtə(r)/noun
- a moving staircase consisting of an endlessly circulating belt of steps driven by a motor, which conveys people between the floors of a public building自动扶梯。
词源
early 20th cent. （originally US, as a trade name）： from escalade 'climb a wall by ladder' （from the noun ESCALADE）, on the pattern of elevator.