/'tændəm; `tændəm/
n
1 bicycle with seats and pedals for two or more people, one behind another（双人或多人骑的）串联式自行车.
2 (idm 习语) in tandem one behind another 一前一後地; 排成纵列
*drive/ride in tandem 一前一後地驾车[骑车]
* horses harnessed in tandem 前後串套着的马
* (fig 比喻) The two systems are designed to work in tandem, ie alongside each other, together. 这两套系统是为同步工作而设计的.
* He and his wife run the business in tandem, ie as partners. 他和妻子共同经营这生意.

n[C]
[Date: 1700-1800; Language: Latin;Origin:'finally, at length' (taken to mean "lengthwise", and so used for vehicles with one horse or person in front of another)]
a bicycle built for two riders sitting one behind the other
in tandem
doing something together or at the same time as someone or something else
　The two companies often work in tandem.
in tandem with
　The group operated in tandem with local criminals.