Replace the B with a using the vi-style "replace single character" commands (that is, click r, and then type a).

使用vi风格的“替换单个字符”命令将b替换为a(即单击r，然后键入A)。

youdao

Their film "The King's Speech, " the fascinating personal and historical story of George VI's work with a therapist to overcome a stutter, was rated R because of one scene involving use of the f-word.

WSJ: Roger Ebert on Movie Ratings