已安装gnuplot，我尝试用`pdflatex -shell-escape`命令行编译MWE
```tex
\documentclass{standalone}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
xlabel=$x$,
ylabel=$\sin(x)$
]
\addplot gnuplot[id=sin]{sin(x)};
\end{axis}
\end{tikzpicture}
\end{document}
```
报错为`"message": "Package pgfplots: Sorry, the gnuplot-result file '123456789.sin.table' could not be found. Maybe you need to enable the shell-escape feature? For pdflatex, this is '>> pdflatex -shell-escape'. You can also invoke '>> gnuplot .gnuplot' manually on the respective gnuplot file..\n",`
是需要配置环境变量吗？我没有其他头绪
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