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谢谢你的帮助!

Hello!

Below is my MWE.

\documentclass{report}

\usepackage{titlesec}
\titleformat{\chapter}[hang]
{\normalfont\normalsize\bfseries\centering}{\chaptertitlename\ \thechapter:}{2mm}{}

\begin{document}
\chapter{The big black bug bit the big black bear, but the big black bear bit the big black bug ...

Hi Stefan,

For example, don't use empty lines in such environments, which stand for paragraph breaks in LaTeX.

I have removed all empty lines and it works. 谢谢你.

Mimi

Hi Stefan!

I got the error ! Paragraph ended before \Grot@box@std was complete. with graphicx package. I did some research on the internet and found this post . So, I added the rotating package to the code you gave and it works.

\documentclass{article}
\usepackage{graphicx}
\usepackage{rotating ...

Hello everyone!

Here, I've attached the picture of the graph I need to draw. As you can see, the picture has 3 similar parts. The code for one of the 3 parts is as below:

\documentclass{article}

\begin{document}

\begin{figure}
\setlength{\unitlength}{0.2in}
\centering
\begin{picture}(14,11 ...