a father爸爸
abbreviation for per annum (= each year)每年(per annum的缩写)
[ C ] UK abbreviation for personal assistant: someone whose job is helping someone in a higher position, especially by writing letters, arranging meetings, and making phone calls私人助理(persoanl assistant的缩写)
US [ C ] UK abbreviation for physician assistant 医生助理(physician assitant的缩写)
[ C usually singular ] also PA system abbreviation forpublic address system (= equipment for making sound, especially someone's voice, louder in a public place)用于公共场合作广播公告的设备系统(public address system的缩写)
[ C ] specialized medical abbreviation for pulmonary artery (= the artery that carries dexogygenated blood from the heart to the lungs)肺动脉(pulmonary artery的缩写)
written abbreviation for the US state of Pennsylvania: used in addresses(美国)宾夕法尼亚州(写地址时Pennsylvania的缩写)
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