根据本教程：http://rspec.codeschool.com/levels/1（2分钟标记）当您输入“gem install rspec”来安装Rspec时，应该下载4个宝石。不过，我的命令行Windows只安装了1个宝石。rspec是否需要安装4个宝石？
Successfully installed rspec-3.0.0
1 gem installed
我是否遗漏了Rspec的其他部分，如果是这样，我该如何手动添加它们？
您可能已经安装了所有的宝石。我第一次安装rspec的我得到安装了6个宝石：
> gem install rspec
Fetching: rspec-support-3.0.4.gem (100%)
Successfully installed rspec-support-3.0.4
Fetching: rspec-core-3.0.4.gem (100%)
Successfully installed rspec-core-3.0.4
Fetching: diff-lcs-1.2.5.gem (100%)
Successfully installed diff-lcs-1.2.5
Fetching: rspec-expectations-3.0.4.gem (100%)
Successfully installed rspec-expectations-3.0.4
Fetching: rspec-mocks-3.0.4.gem (100%)
Successfully installed rspec-mocks-3.0.4
Fetching: rspec-3.0.0.gem (100%)
Successfully installed rspec-3.0.0
6 gems installed
但一旦安装所有的宝石，RSpec的再次安装只显示1颗宝石安装：
> gem install rspec
Successfully installed rspec-3.0.0
1 gem installed
要确认所安装的宝石，运行：
gem list