PWNabbr.脉宽调制（pulse width modification）Pn.字母PP and I clause保赔条款pyrazole amide吡唑酰胺P.E teaching体育教学P. martensii马氏珠母贝P'an Shu-jenpyelophlebitis肾盂静脉炎Pyrus sorotina梨树Pyrus communisn.西洋梨pyloric caecum幽门垂,幽门盲囊P. D. T.[医] 右额横位(胎儿)