VOA慢速英语:New Bike Share Apps in China Create Bike 'Revolution'

convenient - adj. allowing you to do something easily or without trouble​

traffic jams - n. a line of road traffic at or near a standstill because of road construction, an accident, or heavy congestion.​

nostalgic - adj. when something causes you pleasure and sadness by remembering something from the past and wishing that you could experience it again​

rapidly - adj. happening in a short amount of time​