在Beamer中的列内设置换行符(R Markdown)

\begin{columns}
  \begin{column}{0.5\textwidth}
    This is the first line.\newline
    This is the second line.
  \end{column}
  \begin{column}{0.5\textwidth}
    This is another column.
  \end{column}
\end{columns}

\begin{columns}
  \begin{column}{0.5\textwidth}
    This is the first line.\\
    This is the second line.
  \end{column}
  \begin{column}{0.5\textwidth}
    This is another column.
  \end{column}
\end{columns}