PWNabbr.脉宽调制（pulse width modification）Pn.字母PPyrroles/PD吡咯类/药理学pyrrodoxycline氢吡多西环素<抗生素类药>pyknotic bodie致密小体pyorrhea probe牙槽脓肿探针P-Cygni star天鹅座P型星pyleophlebitis门静脉炎pyritic sulfur黄铁矿硫pzotected mode保护模式P plycoprotein抗体pyra-maleate马来酸甲氧苄二胺