Permissible Exposure Limit(Level)允许接触限值 Polyethylene With Low Density低密度聚乙烯 Paid Education Leave支付教育离开 Physics Express Letters物理表达信件 Permissible Exposure Level容许暴露水平,容许照射(量)级 Permissible Exposure Limit允许暴露极限 Protocol Engineering Laboratory协议工程实验室 Primary Effusion Lymphoma原发性渗出性淋巴瘤 Phrenoesophageal LigamentPhrenoesophageal韧带 Picture Element象素 Precautionary Emergency Landing (US DoD)预防紧急降落(美国国防部) Pelagic Fish (FAO fish species code)远洋鱼(FAO鱼类代码) Public Entertainment Licence (UK)公共娱乐牌照(英国) Potential Evasion Locale潜在的闪避现场 Program for Experienced Learners (Eckerd College)对于有经验的学员程序(爱克德学院)