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英语解释:a sloping surface that allows access from one level to a higher or lower level, or raises something up above floor or ground level

1. a sloping surface. 2. a moving staircase.
A ramp is a sloping surface connecting two areas of different levels. Ramps are used instead of staircases in some buildings for use by people who move about in wheelchairs or to be carried on stretchers. A road that leads on to or off from a main road is also a ramp. In airports the movable staircase that passengers use to board the plane and get off from the plane is a ramp.