Open Source Software开放程序代码软件 Office of Strategic Services战略情报局 Office of Space Science太空科学处 Operations Support Services运营支持服务 Operations Support System运行支援系统 Open Sound System开放声音系统 Occupant Sensing System乘员传感系统 Optional State Supplementation备选状态的补充 Office of Space Systems办公空间系统 Office of Statistical Standards办公室的统计标准 On Site Service(s)现场服务(s) On-Board Support Software车载支持软件 Operatore Socio Sanitario社会Sanitario经营者 Overall System Sensitivity (radar)整体系统的灵敏度(雷达) Operations Support System(s)运营支持系统(s)