介绍人的英文：
introducer

Act as an intermediary
充当介绍人

She was my sponsor when I was applying for Party membership.
她是我的入党介绍人。

He was my sponsor when applied for party membership.
他是我的入党介绍人。

The letter from his referee has been left.
来自他介绍人的介绍信被遗忘了。

Your referee is important to your studies.
你的介绍人是谁对你的学业有很大影响。

"But remember, you'll have to give me a finder 's fee since I am acting as your placement agency. "
不过要记着，既然我给你当职业介绍所的介绍人，你要给我职业介绍费。

I should be glad to have a personal interview, and can furnish references if desired.
如能与您面谈，我将极为高兴，如需提供介绍人，我也乐意提供。

To present or introduce officially.
申述正式地引见或介绍

Allow me to introduce myself.
允许我把我自己向你介绍。

The next programme is introduced by David.
下一个节目由大卫主持。

She introduced the visitors into the hall.
她把参观者引进大厅。

She introduced me into the lobby.
她把我引进了休息室。