答案1
我不太了解你的情节,因为你没有提供任何代码。但实现这一点的最简单方法可能是使用类似下面的方法在实际情节外手动绘制三个箭头:
\documentclass[border=10pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\begin{document}
\begin{tikzpicture}
\begin{axis}[clip=false]
\addplot3 coordinates { (0,0,0) (1,0,0) };
\coordinate (axis line origin) at (0,-2.5,-1);
\draw[->] (axis line origin) -- +(0.15,0,0) node[right] (axis line x label) {$X_B$};
\draw[->] (axis line origin) -- +(0,0.5,0) node[right] {$T$};
\draw[->] (axis line origin) -- +(0,0,0.5) node[right] {$p$};
\node[below, font=\small, inner sep=5pt] at (axis line x label) {($X_{BL}$ or $X_{BV}$)};
\end{axis}
\end{tikzpicture}
\end{document}