Have you seen those cool recumbent touring bikes ?
你见过那些很酷横卧旅游自行车?
Most physicians and personal trainers recommend recumbent bikes .
大多数医生和私人教练推荐横卧自行车。
Since then he 's been trying to design his own version , taking cues from the world around him to shape the aerodynamic carbon fiber and kevlar shell built around a low-profile recumbent bicycle .
However , the recumbent bike remains popular with riders who want to trade the old-fashioned saddle for a seat that better supports their back , and among those chasing human-powered vehicle speed records .