翻译自learningpuppet
1、Facts, global variables, and local variables from the current scope are available to a template as Ruby instance variables — instead of Puppetʼs $ prefix, they have an @ prefix. (e.g. @fqdn,@memoryfree, @operatingsystem, etc.)
fact，全局变量和来自当前域的局部变量对于一个模板来说可用，但是作为ruby实例变量来说，他们用@前缀代替puppet的$。比如说（@fqdn，@memoryfree，@operatingsystem等）
2、Variables from other scopes can be accessed with the scope.lookupvar method, which takes a .)
对于其他作用域的变量，能够通过scope.lookupvar方法访问，这种方法不用$引用一个长变量名。（比如，scope.lookupvar（'apache::user'））