检查镜像
gem sources -l
结果打印
*** CURRENT SOURCES ***
https://ruby.taobao.org/
删除源
gem sources --remove (上面打印的URL：https://ruby.taobao.org/)
删除不掉 是没有权限 + sudo
sudo gem sources --remove (上面打印的URL：https://ruby.taobao.org/)
Password: 输入密码
提示：你的这个源 removed from sources 删除成功
这时候添加新源
sudo gem sources --add https://gems.ruby-china.com/
打印结果 https://gems.ruby-china.com/ added to sources
检查结果
sudo gem sources -l
结果打印
*** CURRENT SOURCES ***
https://gems.ruby-china.com/
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终端截图.png
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