taobao Gems 源已停止维护，现由 ruby-china 提供镜像服务 - 开源中国社区
ChenYuans-Air:~ cy$ gem sources
*** CURRENT SOURCES ***
https://ruby.taobao.org/
ChenYuans-Air:~ cy$ gem sources --remove https://ruby.taobao.org/
https://ruby.taobao.org/ removed from sources
ChenYuans-Air:~ cy$ gem source -a https://gems.ruby-china.org/
https://gems.ruby-china.org/ added to sources
ChenYuans-Air:~ cy$ gem source -c
*** Removed specs cache ***
ChenYuans-Air:~ cy$ gem source -u
source cache successfully updated
ChenYuans-Air:~ cy$ gem sources
*** CURRENT SOURCES ***
https://gems.ruby-china.org/
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