Sponsors must be United States citizens or permanent residents. In addition, they must be at least eighteen years old and a bloodrelation of the person seeking residency.
保证人必须是美国公民或永久居民，另外他们必须超过十八岁并和申请者有血缘关系。
2
It provides identity to the cell. eg. antigens on red blood cell in relation to blood group.
它可为细胞提供身分，例如红血球表面的抗原使血液有血型。
3
Attack of the Clones conclusively establishes that these two characters have no bloodrelation, and thus Obi-Wan's brother is an as yet unexplored character.