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参考1(install ssh server):https://tendcode.com/article/virtualbox-install-centos7/
参考2 (setup net transform):http://ubuntuhandbook.org/index.php/2016/04/enable-ssh-ubuntu-16-04-lts/
参考3 (lrzsz 使用软件):https://segmentfault.com/a/1190000012260255