"Pin" 在英语中可以表示多种意思，包括：
1. 针：a small pointed object used for fastening or fixing things together, typically made of metal.
2. 引子、触发器：an action, event, or factor that causes something to happen or to begin.
3. 资格证明：a small metal device worn on clothing as a symbol of membership or authority.
具体含义取决于
中国
数据来源：美国社会保障局 (SSA)