将 .bib 转换为 bibitems

Question

我提交的期刊更喜欢使用bibitems 列表而不是.bib文件。在尝试进行此转换时，我使用了以下建议：这个 SE 问题和这篇博文。

pdflatex在bibtexMWE 上运行

\documentclass{article}
\usepackage[backend=bibtex,style=nature]{biblatex}
\addbibresource{bibliography.bib}
\begin{document}
Theory of superconductivity~\cite{bardeen1957}.
\printbibliography
\end{document}

和bibliography.bib：

@article{bardeen1957,
    title       = {Theory of superconductivity},
    author      = {Bardeen, John and Cooper, Leon N and Schrieffer, J Robert},
    journal     = {Physical Review},
    volume      = {108},
    number      = {5},
    pages       = {1175},
    year        = {1957},
    publisher   = {APS}
}

应生成一个.bbl文件，其中包含以下形式的 bibitems

\bibitem{bardeen1957}
Bardeen, J.
\newblock Theory of superconductivity.
\newblock {\em Physical Review}{\bf 108}
\newblock 1175 (1975)

相反，我进入文件mwe.bbl：

\entry{bardeen1957}{article}{}
  \name{author}{3}{}{%
    {{}%
     {Bardeen}{B.}%
     {John}{J.}%
     {}{}%
     {}{}}%
    {{}%
     {Cooper}{C.}%
     {Leon~N}{L.~N.}%
     {}{}%
     {}{}}%
    {{}%
     {Schrieffer}{S.}%
     {J~Robert}{J.~R.}%
     {}{}%
     {}{}}%
  }
  \list{publisher}{1}{%
    {APS}%
  }
  \strng{namehash}{BJ+1}
  \strng{fullhash}{BJCLNSJR1}
  \field{number}{5}
  \field{pages}{1175}
  \field{title}{Theory of superconductivity}
  \field{volume}{108}
  \field{journaltitle}{Physical Review}
  \field{year}{1957}
\endentry

我做错了什么？我如何获得首选\bibitem{}的条目形式？