pandoc xxx.org -o xxx.docx
pandoc 01-chapter2.markdown -o chapter2.docx -c Github.css
pandoc pandocCh.org -o pandocCh.pdf --latex-engine=xelatex -V mainfont="SimSun"
pandoc pandocCh.org -o pandocCh.pdf --latex-engine=xelatex -template=pm-template.latex
pandoc 01-chapter2.org -o chapter2.html -c Github.css
pandoc -f org -t markdown -o output.md input.org