Phase Alternation Line (television format)阶段交替线(电视格式) Phase Alternating Line相位互換線路規格 Process Architecture Lab建筑实验室过程 Perceptive Assistant That Learns (DARPA)感知助理学(DARPA) Phase Alternation Line逐行倒相制（电视） Police Athletic League警察运动联盟 Pallet/skid栈板 Pinhole Alc Lons针孔型自动亮度控制镜头 Prescription Access Litigation Project诉讼时效访问项目 Peninsula Athletic League (San Francisco Bay Area)半岛运动联盟(旧金山海湾地区) Public Archaelogy Laboratory (Cultural Resources Identification)公共Archaelogy实验室(文化资源识别) Poverty Action Lab贫困行动的实验室 Pathology Associates of Lexington, PA (West Columbia, SC)病理学的合伙人列克星敦,PA(西哥,SC) Polyvalente de l'Ancienne-Lorette (Quebec, Canada)Polyvalente de fixation 'Ancienne-Lorette(加拿大魁北克) Prescribed Action Link规定动作链接