Sun Protection Factor (sun block rating)防晒系数(防晒) Single Point Failure单点失效 Software Production Facility (NASA)软件生产设备(NASA) Shipper Paid Forwarding (US Postal Service program for payments)支付货物托运人美国邮政服务项目为支付 Standard Project Flood标准设计洪水 Service Port Function业务口功能 Sphase promoting factor促S期因子 spare parts financing零部件融资 Subscriber Plant Factor用户设备因数 Space Power Facility (NASA)美国国家航空和宇宙航行局的电力设施(空间) Strategic Prevention Framework (US federal grant program)预防框架(我们的战略计划的联邦资助) Sodium Process Facility钠的过程 Signal Processing Facility信号处理设施 Sender Policy Framework (antispam initiative)发件人的政策框架(antispam主动) Sensor Fusion Post传感器融合