你要理解每个命令的意思
`\hangindent`:
> If positive, this indicates indentation from the left margin; if negative, this is the negative of the indentation from the right margin.
`\hangafter`:
> If positive, this denotes the number of lines before indenting starts; if negative, the absolute value of this is the number of indented lines starting with the first line of the paragraph. Default: 1.
也就是说你从第一行后都会缩进0.4cm
最后,`\rightline`并不是右对齐,它的定义等同于`\hbox to \hsize{\hss#1}`,`\hsize`就是段落宽度,也就是说你放了个宽度为当前段落宽度的盒子在第二行,但是从第二行开始就有有0.4cm的缩进了,自然就超出了边界
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