See /Users/luowanqian/local/texlive/2019/index.html for links to documentation.
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Add /Users/luowanqian/local/texlive/2019/texmf-dist/doc/man to MANPATH.
Add /Users/luowanqian/local/texlive/2019/texmf-dist/doc/info to INFOPATH.
Most importantly, add /Users/luowanqian/local/texlive/2019/bin/x86_64-darwinlegacy