Safe, Productive, Infrastructure-Friendly (vehicles)安全、高效、Infrastructure-Friendly(车) Shuttle Payload Integration Facility航天飞机载荷集成设备 Shuttle/POCC Interface Facility (NASA)飞船/ POCC接口设备(NASA) Sales Promotion Incentive Fund (sometimes written SPIFF)促销激励基金(有时写SPIFF) Shuttle Projects Information Frontier航天飞机项目信息 Sales Performance Incentive Fund销售业绩奖励基金 Stamps Perforated for Individuals or Firms (stamp collecting)邮票上穿孔的个人或公司(集邮) Security Policy Information File安全政策信息的文件 Special Performance Incentive Fund奖励资金特殊性能 Single Point Incremental Forming单点数控渐进成形 Sales Person Incentive Fund销售人员奖励基金 SACDIN Program Integration Facility (USAF)SACDIN项目集成设备(美国空军) Shoreline Park Improvement Fund (Seattle, WA)海岸线公园改善基金(西雅图,华盛顿州) State Plane International Foot飞机国际足状态 solid-phase immunoassay fluorescence固相荧光免疫测定法