tan·dem /ˈtændəm/
  (ad.)前後直排地,縱排地(a.)縱排的,串聯的前後縱排的兩匹馬或馬車
  tandem
  串行
  tandem
  串接
  Tan·dem adv. & a.  One after another; -- said especially of horses harnessed and driven one before another, instead of abreast.
  Tan·dem, n.
  1. A team of horses harnessed one before the other. “He drove tandems.”
  2. A tandem bicycle or other vehicle.
  Tandem bicycle or  Tandem tricycle, one for two persons in which one rider sits before the other.
  ◄ ►
  tandem
       n : a bicycle with two sets of pedals and two seats [syn: bicycle-built-for-two,
            tandem bicycle]
       adv : one behind the other; "ride tandem on a bicycle built for
             two"; "riding horses down the path in tandem"