The following example:
\documentclass{article}
\ Title {\ LaTeX {and ZhiDao}
\ Date {2065 1 Month 438 +08}
\usepackage{amsmath}
\usepackage{bm}
\ begin {document}
\ Make a title
\begin{align}
\mathbf{Acd}=Acd \\
\mathbf{\alpha}=\alpha \\
\boldsymbol{\sigma}=\sigma \\
\bm{\beta}=\beta
\end{align}
\end{document}
The output result is:
You can see that 1, 3, 4 are not bold, and 2 is not bold. You cannot adjust the code box, which is represented by a list. Just remove the previous numbers.