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这个问题跟默认的markdown引擎相关，2个dash被转成了1个dash，可以考虑在markdown文件中添加反斜杠，防止被转义, 类似于:

原来内容: 默认情况下，date命令显示本地时间。要显示UTC时间，添加--utc或-u参数：
修改为: 默认情况下，date命令显示本地时间。要显示UTC时间，添加\-\-utc或-u参数：

Thanks to @TommyLike

@chenyujia1021 please check whether you can find a perfect solution to change the parser.

资料源码中已修改为--，从而显示为--。