We used a middleman in Tokyo to arrange meetings with local suppliers.

我們透過東京一位有門路的人，安排與當地供應商見面。

Our travel agent acted as a middleman and got us a cheaper hotel rate.

我們的旅行社幫忙牽線，替我們拿到更便宜的飯店房價。

The recruiter served as a middleman between the startup and several senior engineers.

那位獵頭在新創公司和幾位資深工程師之間居中牽線。