答案1
像这样?
使用该forest
包相对容易:
\documentclass[border=3.14159mm]{standalone}
\usepackage{forest}
\begin{document}
\begin{forest}
for tree={
% nodes
minimum width = 4em,
delay = {where content={}{shape=coordinate}{},
% tree
calign=fixed edge angles,
calign angle=60,
grow=north,
},
}
% tree body
[
[
[
[,tier=L]
[
[]
[]
]
]
[~,phantom,fit=band]
[
[,tier=L]
[
[,tier=L]
[]
]
]
]
]
\end{forest}
\end{document}