Project Closure Tracking System (construction software)建设项目封跟踪系统(软件) POSIX Conformance Test SuitePOSIX标准符合性测试套件 Polk County Transit Services波尔克郡运输服务 Professional Communication and Translation Studies (International Conference)专业交流及翻译研究(国际会议) Program Correspondence Tracking System节目对应的追踪系统