如何在Ruby中查询嵌套哈希?

Ruby中检索正确哈希的最快方法是什么 language 从以下嵌套哈希:

COUNTRIES = {
  "DE" => {:currency => "EUR", :tax_rates => [19, 7], :languages => ["de-de"]},
  "US" => {:currency => "USD", :tax_rates => [10], :languages => ["en-us"]}
}

我通过提供 currency :

COUNTRIES.select{|key, hash| hash[:currency] == "USD" }

但是我如何通过 语言 ,例如 en-us ?

谢谢你的帮助。