最近投稿过程中发现Springer的模板只能用Bibitem，而非像IEEE的模板一样可以自动生成。

而网上有许多馊主意，例如手动写Bibitem，或者引用一些无用的包，但实际上都是浪费时间。没有用。

最后在StackExchange发现了解决办法，先上解决方案，后面给出详细分析：

在su-jnl文件中找到开头与结尾

%% Macros for bibliographystyles %%
.......
%% Macros for border matrix %%

的段落，大概在1700行左右，将对应的引用替换掉，替换为下述代码

%% Macros for bibliographystyles %%% \def\bibcommenthead{\if@bibcomment\begingroup\parindent=0pt\parskip=0pt%
% \removelastskip\vskip13pt\nointerlineskip%
%
% \vbox{\bibfont If you are submitting to one of the Nature Research journals, using the eJP
%  submission system, please include the references within the manuscript file itself. You may
%  do this by copying the reference list from your .bbl file, and pasting it into the bibliography
%  environment of the main manuscript .tex file.}\par%
% \removelastskip\nobreak\vskip13pt\nobreak%
% \endgroup\fi}%\def\bibcommenthead{}%\if@Spr@basic@refstyle%\usepackage[authoryear]{natbib}%\gdef\NumBib{NO}%\bibliographystyle{bst/sn-basic}%\setlength{\bibsep}{1em}%\def\bibfont{\reset@font\fontfamily{\rmdefault}\normalsize\selectfont}%
\fi%
\if@Mathphys@refstyle%\usepackage[numbers,sort&compress]{natbib}%\gdef\NumBib{YES}%\bibliographystyle{bst/sn-mathphys}%\setlength{\bibsep}{1em}%\def\bibfont{\reset@font\fontfamily{\rmdefault}\normalsize\selectfont}%
\fi%
\if@APS@refstyle%\usepackage[numbers,sort&compress]{natbib}%\gdef\NumBib{YES}%\bibliographystyle{bst/sn-aps}%\setlength{\bibsep}{1em}%\def\bibfont{\reset@font\fontfamily{\rmdefault}\normalsize\selectfont}%
\fi%
\if@Vancouver@refstyle%\usepackage[numbers,sort&compress]{natbib}%\gdef\NumBib{YES}%\bibliographystyle{bst/sn-vancouver}%\setlength{\bibsep}{1em}%\def\bibfont{\reset@font\fontfamily{\rmdefault}\normalsize\selectfont}%
\fi%
\if@APA@refstyle%\usepackage[natbibapa]{apacite}%\gdef\NumBib{NO}%\bibliographystyle{bst/sn-apacite}%\def\refdoi#1{\urlstyle{rm}\url{#1}}%\renewcommand{\doiprefix}{}%\AtBeginDocument{%\renewcommand{\BPBI}{.}% Period between initials - command from apacite.sty}%\setlength{\bibsep}{1em}%\def\bibfont{\reset@font\fontfamily{\rmdefault}\normalsize\selectfont}%
\fi%
\if@Chicago@refstyle%\usepackage[authoryear]{natbib}%\gdef\NumBib{NO}%\bibliographystyle{bst/sn-chicago}%\hypersetup{urlcolor=black,colorlinks=false,pdfborder={0 0 0}}\urlstyle{same}%\setlength{\bibsep}{1em}%\def\bibfont{\reset@font\fontfamily{\rmdefault}\normalsize\selectfont}%
\fi%
\if@Standard@Nature@refstyle%\usepackage[numbers,sort&compress]{natbib}%\gdef\NumBib{YES}%\bibliographystyle{bst/sn-standardNature}%\setlength{\bibsep}{1em}%\def\bibfont{\reset@font\fontfamily{\rmdefault}\normalsize\selectfont}%
\fi%
\if@Default@refstyle%\usepackage[numbers,sort&compress]{natbib}%\gdef\NumBib{YES}%\setlength{\bibsep}{1em}%\def\bibfont{\reset@font\fontfamily{\rmdefault}\normalsize\selectfont}%
\fi%\AtBeginDocument{\allowdisplaybreaks}%\def\eqnheadfont{\reset@font\fontfamily{\rmdefault}\fontsize{16}{18}\bfseries\selectfont}%\newcommand{\eqnhead}[1]{\begingroup%
\begin{center}
{\eqnheadfont #1}\par%
\end{center}
\removelastskip\vskip24pt%
\thispagestyle{titlepage}%%
%%\thispagestyle{empty}%
\endgroup}%% Macros for border matrix %%

后附英文版的原因分析：