1.(bicycle)双人自行车
2.(carriage)纵列二马拉的双轮马车
3.(team of two horses)纵列拉马车的两匹马
4.(team of two people)二人工作组
5.in tandem
(with thing or people)同时；一起
From then on, the stock market and the economy recovered in tandem.从那时起, 股票市场和经济同时复苏了。
They are working in tandem.他们正在一起工作。