PWL=Power Level (声)能级,功率级,电平Pn.字母Ppyrazolidine吡唑烷pyriform sac梨状囊P.italicum青霉菌pyrheliomete太阳热量计, 日射强度计P'aldal WardP. jocosus红耳鹎P. E class体育课pyrrolidinyl吡咯烷基P.armandii华山松pyriformaxis梨状轴