es·ca·la·tor /ˈɛskəˌletɚ/
 電動扶梯


 Es·ca·la·tor n.  A stairway or incline arranged like an endless belt so that the steps or treads ascend or descend continuously, and one stepping upon it is carried up or down; -- originally a trade term, which has become the generic name for such devices.  Such devices are in common use in large retail establishments such as department stores, and in public buildings having a heavy traffic of persons between adjacent floors.

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 escalator
      n 1: a clause in a contract that provides for an increase or a
           decrease in wages or prices or benefits etc. depending
           on certain conditions (as a change in the cost of living
           index) [syn: escalator clause]
      2: a stairway whose steps move continuously on a circulating
         belt [syn: moving staircase, moving stairway]