答案1
像这样?
\documentclass[border=3.141592]{standalone}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}
\begin{document}
\begin{tikzpicture}[
alr/.style = {draw=red!50, line width=2pt, semitransparent,
{Bracket[reversed,line join=miter,scale=0.8]}-{Bracket[reversed,line join=miter,scale=0.8]}
},
ar/.style ={-Straight Narb}
]
\draw (-5mm,0) -- ++ (9,0);
\foreach \i [count=\x from 0] in {-N, 0, N, 2N, 3N}
\draw (2*\x,1mm) -- ++ (0,-2mm) node[below] {$\i$};
%
\draw[alr] ( 1mm,0) -- (39mm,0);
\draw[alr] (41mm,0) -- (79mm,0);
\end{tikzpicture}
\end{document}