In one experiment, nearly 200 participants boarded a double-decker bus for a tour of Philadelphia.
在一项实验中，近200名参与者登上一辆双层巴士游览费城。
The company's 164 trams, including two open-balcony trams for tourists and private hire and one special maintenance tram, make up the world's only fully double-decker tram fleet.
整支电车车队共有164辆电车，包括两辆开篷古典电车，供游客和私人租用，以及一辆特别维修电车。这支车队是世界上唯一全由双层电车组成的车队。
The company's 164 trams, including two open-balcony trams for tourists and private hire and one special maintenance tram, make up the world's only fully double-decker tram fleet.
整支电车车队共有164辆电车，包括两辆开篷古典电车，供游客和私人租用，以及一辆特别维修电车。这支车队是世界上唯一全由双层电车组成的车队。
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