The bus uses a hybrid system that combines the hydrogen fuel cells with high power batteries.

VOA: special.2009.09.07

I ride, they call it Muni, but it's the bus system here.

我乘坐这里人所称的有轨电车。

没有智能手机活不了 - SpeakingMax英语口语达人

London's overcrowded bus and subway system might also benefit from the bikes.

VOA: standard.2010.07.30