在newtheorem环境前面生成空白区

maybe related: https://ask.latexstudio.net/ask/question/17595.html

• 标签不要放一些诸如『大佬救命』的内容，适得其反...
• 代码要用markdown语法，不然无法正确高亮
• 可以关注一下\parindent以及\indent和\noindent的作用，少用\\

如非必要，勿增实体。只用了amsthm的功能实现...

\documentclass[12pt]{ctexbook}
\usepackage[showframe]{geometry}
\usepackage{amsmath,amsthm}
% \usepackage{hyperref}
\newtheoremstyle{qaqstyle}
    {3pt} % Space above
    {3pt} % Space below
    {} % Body font
    {1cm} % Indent amount(修改间距)
    {\bfseries} % Theorem head font
    {:} % Punctuation after theorem head(冒号)
    {.5em} % Space after theorem head
    {\thmname{#1}\thmnumber{ #2}.\thmnote{ #3}} % Theorem head spec (can be left empty, meaning `normal')
\theoremstyle{qaqstyle}%切换为新样式
\newtheorem{example}{例}[section]
\setlength{\parindent}{0pt}%取消段前缩进
\begin{document}
    % 1\\%这一行的缩进是默认的\parindent

    对比

    \hspace{1cm}对比:你应该用theorem的title, 而不是自己手动输入『\texttt{\char92 textbf{椭球面：}}』
    \begin{example}[椭球面]
        $\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}+\frac{z^{2}}{c^{2}}=1$
    \end{example}
\end{document}