Writing a presentation frame and its corresponding narration at the same time can help us to reduce the complexity.
In other words, I need a mechanism as follows (it is a pseudo-code)
\begin{frame}{Introduction}
\begin{slide}
%slide content to show
\end{slide}
\begin{narration}
%narration goes here.
\end{narration}
\end{frame}
\begin{frame}{Definition}
\begin{slide}
%slide content to show
\end{slide}
\begin{narration}
%narration goes here.
\end{narration}
\end{frame}
%etc...
Is there a package to write slide and narration contents at the same time but produces each separately at the final?