PCA

剑桥词典

[ 不可数或单数名词：没有复数形式的名词 ]
abbreviation for patient controlled analgesia: a process in which patients suffering pain can control when and how they receive a drug to reduce their pain
自控式镇痛（patient controlled analgesia的缩写）
[ 可数名词：有复数形式的名词 ]
abbreviation for posterior cerebral artery : a blood vessel that supplies blood to the back of the brain
大脑后动脉（Posterior cerebral artery的缩写） 返回 PCA