tandem
Word family adverbtandemwisenountandem
tan·dem /ˈtændəm/ noun [countableC] 1. TTBa bicycle built for two riders sitting one behind the other 双人自行车 2 in tandem TIME/AT THE SAME TIMEdoing something together or at the same time as someone or something else 协同工作,一起工作 The two companies often work in tandem. 两家公司经常合作。
in tandem with The group operated in tandem with local criminals. 该团体和当地的犯罪分子勾结在一起。
Origin tandem (1700-1800) Latin “finally, at length” (taken to mean "lengthwise", and so used for vehicles with one horse or person in front of another)