回复：谢谢你的分享！只是对这句比较怀疑：

"Foreign nationals who have permanent resident status may qualify to "buy" Medicare coverage if they have lived in the United States continuously for at least five years and if they are at least 65 years old."

http://ezinearticles.com/?How-Your-Non-Citizen-Parent-Can-Get-Medicare&id=873991