an open automobile having a front seat and a rumble seat
同义词：runabout, two-seater
a small lightweight carriage; drawn by a single horse
同义词：buggy
roadster详细解释
road.ster n.（名词）An open automobile having a single seat in the front for two or three people and a rumble seat or luggage compartment in the back.敞篷客车：一种车前装有可供二三人坐的排座，车后设有可作行李仓的折叠加座的敞篷车A horse for riding on a road.用于在公路上骑的马
