n.串联；串联式自行车
A series circuit is one in which two or more pieces of apparatus are connected end to end or in tandem. 串联电路是一种两个以上元件尾衔接或串在一起的电路。
I've never ridden a tandem bicycle before. 我从来没骑过双人自行车。
You have a choice of a tandem if you want to ride together. 你们要共骑的话，可选择双人自行车。
串翼自行车
