为男女双方建立恋爱、婚姻关系而提供媒介to act as a go-between; to pull strings and put up a bridge

喻指为欲建立某种关系的各方作介绍、撮合，使建立联系to act as an intermediary

• 为当地招商引资牵线搭桥

  act as an middle-man to attract trade and investment

• 利用党际关系渠道为西部招商引资牵线搭桥。

  Use inter-party relations to act as a broker in attracting trade and investment in Western China.