Pie in the Sky不能保证实现的允诺 Pay Is The Same工资是相同的 Project Issue Tracking System工程问题的追踪系统 Pacific International Trials Society (motorcycle trials group)太平洋国际实验协会(摩托车实验小组) Person in the Street人在街上 Project Information Tracking System项目信息跟踪系统 Portable Infantry Target System便携式步兵目标体系 Populated Information Terrain System人口密集的信息系统地形 Petroleum Industry Training Service石油行业培训服务 Prayer Intention Trust And Surrender意图的信任和投降。祷告 Persistent Information Technology System信息技术的持续 Platform Integrated Transmitter System平台集成发射机系统 Program Information Tracking System项目信息跟踪系统 Pollution In The Streams污染的河流 Persistently Intimidating Technology Syndrome持续威胁技术综合症