Ruby on rails 3 扩展YAML别名锚

我正在尝试构造动态YAML以返回字符串，我想知道是否可以用YAML执行类似的操作

en:
  occupation: "Studying #{department} at %{university} %{*speciality}"
  speciality: &speciality "specialising in %{subject}"

预期产量 目前我认为唯一可行的方法是

subject = "Ruby"
I18n.t(:occupation, :department => "Computer Science", 
                    :university => "Staffordshire University", 
                    :subject    => (
                      I18n.t(:speciality, :subject => subject) if subject
                    ))
#=> "Studying Computer Science at Staffordshire University specialising in Ruby"

subject = "Ruby"
I18n.t(:occupation, :department => "Computer Science", 
                    :university => "Staffordshire University", 
                    :subject    => (
                      I18n.t(:speciality, :subject => subject) if subject
                    ))
#=> "Studying Computer Science at Staffordshire University specialising in Ruby"