jiè shào
介绍信
jiè shào xìn
Letter of introduction; Reference letter
介绍人
jiè shào rén
Introducer; Referee; Person who introduces
我给你介绍一下,这位是张先生。
wǒ gěi nǐ jiè shào yī xià, zhè wèi shì zhāng xiān sheng
Let me introduce you, this is Mr. Zhang