我正在使用 Elsevier 模板撰写稿件。我需要摘要采用双倍行距。最后，在尝试了各种选项来设置摘要的行距后，摘要终于变成了双倍行距。但是，我的摘要现在以“doublespace”一词开头。为什么会发生这种情况以及如何删除它？
%% Copyright 2019 Elsevier Ltd
%%
%% This file is part of the 'CAS Bundle'.
%% --------------------------------------
%%
%% It may be distributed under the conditions of the LaTeX Project Public
%% License, either version 1.2 of this license or (at your option) any
%% later version. The latest version of this license is in
%% http://www.latex-project.org/lppl.txt
%% and version 1.2 or later is part of all distributions of LaTeX
%% version 1999/12/01 or later.
%%
%% The list of all files belonging to the 'CAS Bundle' is
%% given in the file `manifest.txt'.
%%
%% Template article for cas-dc documentclass for
%% double column output.
\documentclass[a4paper,fleqn]{cas-sc} %cas-dc for double columns
\usepackage[authoryear, round]{natbib}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lipsum}
\usepackage{setspace} % line spacing set at introduction
\begin{document}
\let\WriteBookmarks\relax
\def\floatpagepagefraction{1}
\def\textpagefraction{.001}
\shorttitle{XYZ}
\shortauthors{F. Bar et~al}
\title [mode = title]{Title}
\begin{abstract}
\begin{doublespace}
\linespread{1.6}\selectfont
$\leftarrow$ Look at what my abstract starts with... % my problem (see screen clipping)
\end{doublespace}
\end{abstract}
\begin{keywords}
A \sep
B
\end{keywords}
\maketitle
\doublespacing
\setlength{\parskip}{1em}
\renewcommand{\baselinestretch}{2}
\modulolinenumbers[1]
\linenumbers
\section{Introduction}
\lipsum[10]
\end{document}