既然你认识这里的每个人，能请你负责介绍吗？

Could you please handle the ___introduction since you know everyone here?

活动以所有新成员的介绍开始。

The event started with the ___introduction of all the new members.

当陌生人第一次见面时，礼貌的介绍有助于缓解紧张气氛。

A polite ___introduction helps ease the tension when strangers meet for the first time.