8老师，我是绿卡的时候领养的孩子已经在美国和我生活超过了两年。我给孩子递交了绿卡申请，今天收到移民局要求补材料的信，其中两条是：
1. A copy of your final adoption decree registered with the appropriate civil authority indicating legal custody for at least two(2) years.
2. A copy of your court order granting legal custody issued by the appropriate civil authority prior to the finalization of your adoption and a copy of your final adoption decree registered with the appropriate civil authority.
我已经提交了中国民政局签发的领养证，还有公证处的公证书，貌似中美的法律制度不太一样。怎样才能证明国内民政局的文件相当于美国的法庭最终判决呢？
非常感谢！！