perceive perceptibly perennial perfunctory perimeter periodical periphery permanent permeate permit permit pernicious perpendicular perpetrator perpetuate perplex persecute persist personnel perspective pertinent perturb pervasive perversion pesticide petition petroleum pharmacy phase philanthropic philosophy photon photosynthesis physiology pigment pinpointperceive [ pə'si:v ] v.察觉,发觉 perceptibly [ pə'septəbli ] adv.可察觉地,可辨地 perennial [ pə'reniəl ] adj.长期的; n.多年生植物 perfunctory [ pə'fʌŋktəri ] adj.草率的;敷衍的 perimeter [ pə'rimitə ] n.周长 periodical [ ,piəri'ɔdikl ] adj.周期的,定期的;期刊的; n.期刊 periphery [ pə'rifəri ] n.外围 permanent [ 'pə:mənənt ] adj.永久的;固定的 permeate [ 'pə:mieit ] v.扩散;渗透 permit [ pə'mit ] v.允许,许可 permit [ 'pə:mit ] n.通行证,许可证 pernicious [ pə'niʃəs ] adj.有害的;致命的 perpendicular [ ,pə:pən'dikjulə ] adj.垂直的 perpetrator [ 'pə:pitreitə ] n.作恶者,犯罪者 perpetuate [ pə'petʃueit ] v.延长…的存在,使永记不忘 perplex [ pə'pleks ] v.使(某人)困惑;(使)复杂化 persecute [ 'pə:sikju:t ] v.迫害 persist [ pə'sist ] v.坚持;继续 personnel [ ,pə:sə'nel ] n.全体人员;人事部门 perspective [ pə'spektiv ] n.(看待事物的)角度,观点 pertinent [ 'pə:tinənt; 'pə:tənənt ] adj.相关的 perturb [ pə'tə:b ] v.打扰;【天】摄动(引起天体轨道变化) pervasive [ pə'veisiv ] adj.普遍的,流行的 perversion [ pə'və:ʃn; pə'və:ʒn ] n.曲解,颠倒 pesticide [ 'pestisaid ] n.杀虫剂 petition [ pə'tiʃn ] n.请愿;请愿书 petroleum [ pə'trəuliəm ] n.石油 pharmacy [ 'fɑ:məsi ] n.药房 phase [ feiz ] n.阶段 philanthropic [ ,filən'θrɔpik ] adj.慈善的,乐善好施的 philosophy [ fi'lɔsəfi ] n.哲学;哲理,见解 photon [ 'fəutɔn ] n.光子,光量子 photosynthesis [ ,fəutəu'sinθəsis ] n.光合作用 physiology [ ,fizi'ɔlədʒi ] n.生理学;生理机能 pigment [ 'pigmənt ] n.天然色素;干粉颜料 pinpoint [ 'pinpɔint ] v.精确定位;准确解释或确定