南非内政部移民专页：http://www.dha.gov.za/index.php/immigration-services
南非永居：https://www.southafrica-usa.net/homeaffairs/immigration.htm#:~:text=Section%2027(f)%20refers%20to,a%20retirement%20account
南非退休签证：https://www.southafrica-usa.net/homeaffairs/permit_retired.htm
