1. The 1.mac itself has ruby’s environment, so it does not need to be installed. At the same time, it detects version information:

$ gem -v
 2.0.14.1
 $ ruby -v
 ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin16]

2. Use Taobao image:

$ gem sources -l
 *** CURRENT SOURCES ***
 
 https://ruby.taobao.org/

3. Install sass:

$ gem install sass
 ERROR:  While executing gem ... (Gem::DependencyError)
 Unable to resolve dependencies: sass requires sass-listen (~> 4.0.0)

I would like to ask why the installation was not successful. And how to install successfully, thank you