Source Input Format原始输入格式 Signaling Information Field信令信息字段 Step Index Fiber突变型多模光纤 Scientific Instrument Formatter (NASA)Formatter(NASA)的科学仪器 Standard Simulator Database Interchange Format数据库格式标准模拟器 Svenska Industritjänstemannaförbundet (Swedish Industrial Workers Union)Svenska Industritjänstemannaförbundet (Swedish Industrial Workers Union) SOGS Integration FacilitySOGS集成设备 Selective Identification Feature选择鉴别特征 Standard Interchange Format标准图像交换格式 As If好像 Secondary Infertility次因性不孕 Stress Intensity Factor应力场强度系数 Stateful Inspection Firewall状态检查防火墙 State Insurance Fund (Puerto Rican government agency)国家保险基金(波多黎各的政府机构) Software Input Form软件的输入表单