Meaning of sī rén:
私人
private; personal; interpersonal
Zhè shì yī cì sīrén huìyì.
这是一次私人会议。
This is a private meeting.
Zhè běn shū shì wǒ de sīrén shōucáng.
这本书是我的私人收藏。
This book is part of my personal collection.
Zhè shì yī gè sīrén jùhuì.
这是一个私人聚会。
This is a private gathering.
sb with whom one has a close personal relationship; a member of one's clique
Tā shì wǒ de sīrén péngyǒu.
他是我的私人朋友。
He is my close personal friend.
Tā shì wǒ fēicháng yàohǎo de péngyǒu, yě shì wǒ de sīrén gùwèn.
他是我非常要好的朋友,也是我的私人顾问。
He is a very close friend of mine and also my personal advisor.