Professional Employer Organization专业的雇主组织 Philanthropic and Educational Organization for Women (PEO International)慈善和教育机构(而国际) Polyethylene Oxide聚氧化乙烯 Professional Engineers Ontario专业的工程师安大略省 Polar Earth Orbit极地地球轨道 Professional Engineers of Oregon俄勒冈州的专业技术人员 Primer Estado Oculto (Spanish: Hidden First State; cryptographic protocol)Oculto(西班牙语:底漆封锁的密码协议的第一州"隐藏) Pan-Cyprian Labor Federation (Cyprus)Pan-Cyprian劳动联合会(塞普勒斯) Performing Engineering Operations (UK)执行工程业务(英国) Plant Equipment Operator工厂设备的操作 Program Enrichment Office程序浓缩的办公室 Pacific Economic Outlook太平洋地区经济展望 Pre-Existing Ordering既有订购 Physical Education Officer (UK)体育官员(英国) Personnel Executive Officer人事行政长官