N-COUNT (美国公民或美国居民的) 社会保险号码A Social Security number is a nine digit number that is given to U.S. citizens and to people living in the U.S. You need it to get a job, collect Social Security benefits and receive some government services. (美国公民或美国居民的) 社会保险号码
Questions such as date of birth and Social Security number are straightforward.