在这部纪录片中，叙述者是一位著名历史学家。

In this documentary, the ___narrator is a renowned historian.

叙述者的视角塑造了我们对主角动机的理解。

The ___narrator's perspective shapes our understanding of the protagonist's motives.

一个熟练的叙述者甚至能让平凡的事件显得迷人。

A skilled ___narrator can make even mundane events seem captivating.