```tex \documentclass[a4paper,UTF8,twoside]{article} \usepackage{amsmath} \usepackage{amssymb} \usepackage{tikz-cd} \usepackage[heading=true]{ctex} \usepackage[margin=20mm]{geometry} \begin{document} \section{} \begin{tikzcd} A\arrow[r,"\phi"] \arrow[rd] &B\\ &C \end{tikzcd} \begin{tikzcd} A\arrow[r,"\phi"]\arrow[d,red] &B\arrow[d,"\psi" red]\\ C\arrow[r,"\eta" blue] &D \end{tikzcd} \begin{tikzcd} A\arrow[r,"\phi"]\arrow[d,red,"x","y"'] &B\arrow[d,"\psi" red]\\ C\arrow[r,"\eta" blue] &D \end{tikzcd} \begin{tikzcd} A\arrow[r, "\phi" near start, "\psi"', "\eta" near end] &B \end{tikzcd} \begin{tikzcd} A\arrow[r, "\phi" very near start, "\psi"', "\eta" very near end] &B \end{tikzcd} \begin{center} \begin{tikzcd} A\arrow[r, "\phi" very near start, "\psi"', "\eta" very near end] &B \end{tikzcd} \end{center} \section{} \begin{tikzcd} T\arrow[rrd, bend left, "x"] \arrow[rd, dotted, "{(x,y)}"] \arrow[rdd, bend right, "y"] & &\\ &X\times_Z Y\arrow[r,"p"] \arrow[d,"q"] &X\arrow[d,"f"]\\ &Y\arrow[r,"g"] &Z \end{tikzcd} \begin{tikzcd} T\arrow[rrd, bend left, "x"] \arrow[rd, dotted, "{(x,y)}" description] \arrow[rdd, bend right, "y"] & &\\ &X\times_Z Y\arrow[r,"p"] \arrow[d,"q"] &X\arrow[d,"f"]\\ &Y\arrow[r,"g"] &Z \end{tikzcd} \begin{tikzcd} T\arrow[rrd] \arrow[rrd, bend left, "x"] \arrow[rd, dotted, "{(x,y)}" description] \arrow[rdd] \arrow[rdd, bend right, "y"] & &\\ &X\times_Z Y\arrow[r,"p"] \arrow[d,"q"] &X\arrow[d,"f"]\\ &Y\arrow[r,"g"] &Z \end{tikzcd} \begin{displaymath} qqq \end{displaymath} ``` 有以下三个问题： 1.居中显示采用center环境，是最佳方案吗？ 2.如何让section2的三个交换图横向并排？ 3.如何实现左侧是交换图，右侧是其他的内容？比如，最下面的displaymath环境直接在图表的下方，请问如何让其在图表的右侧？ 谢谢！