如何在正文引用参考文献时，将et.al,变为中文的“等人” about zjuthesis

[hushidong]

% !TeX encoding = UTF-8

\documentclass[UTF8,fontset=windows]{ctexart}

\begin{filecontents}[force]{\jobname.bib}
@article{Li1999,
  author  = {李晓东 and 张庆红 and 叶瑾琳},
  title   = {气候学研究的若干理论问题},
  journal = {北京大学学报: 自然科学版},
  year    = {1999},
  volume  = {35},
  number  = {1},
  pages   = {101--106}
}

@book{Brooks2000,
	location = {Chicago},
	title = {Troubling confessions: Speaking guilt in law and literature},
	publisher = {University of Chicago Press},
	author = {Brooks, Peter and other},
	date = {2000},
	langid = {american},
}

\end{filecontents}

\usepackage[backend=biber,style=gb7714-2015,gbcitelocal=chinese]{biblatex}
\addbibresource{\jobname.bib}

\DefineBibliographyStrings{english}{
andincitecn = {和},
andothersincitecn = {等人}, 
}
\DeclareDelimFormat[textcite,citet]{andothersdelim}{}%

\begin{document}

\citet{Li1999}提出了。

\citet{Brooks2000}提出了。

\textcite{Li1999}提出了。

\textcite{Brooks2000}提出了。

\printbibliography

\end{document} 

结果为：