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社会安全号码（SSN）
美国社会保障号码。就业、开设银行账户、申请信用卡和获取驾照所需的9位数号码。E-2签证持有人入境后可在社会保障局（SSA）申请，通常2-4周内收到。SSN是个人信息的核心，需严格保管。
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