谢谢8老师回复
还有几个问题不太明白
1. 关于分开邮寄，我在网上找到的答案是，分开装档案袋（例如：文件包A放入父亲的材料，文件包B放入母亲的材料），然后放入同一个快递箱邮寄，这样做移民局也会明白这是两份申请而不是一份吧？
-It is fine. Just write the applicant's name on the front of the document bag, such as: Applicant: XXX.
6. Employment history
485 part 4 问的比较细，要求列出五年内的工作。父母退休已经超过五年，需要在问题7里列出退休前的工作单位信息，地址和日期吗？
-Not. need.
第一项Employer or School和第二项Name of Employer or School 分别应该写什么？
-Put "N/A" in the Employer's Name/Address. Put "Retired" in Your Occupation part. For "Date From," enter the date your retirement began (even if it was more than 5 years ago). For "Date To," enter "Present".
source of financial support应写什么？
-Just put "Retirement benefits".
For Item 8 above (in your question), "Most Recent Employment or school Outside the U.S.":
Regardless of how long ago it occurred, your parents must provide their most recent employer or school in China (outside the United States), because it was not already listed in the 5-year history above in your parents' cases.
