to speak to people in other organizations, etc. in order to work with them or exchange information with them

Our head office will liaise with the suppliers to ensure delivery. 我们总部会与供应商联系以保证交货。

to be the link between two or more people, organizations, etc.

Her department liaises between the development team and the regional offices. 她的部门负责发展团队与地区办公室之间的联络。