前缀per-来自拉丁介副词per，它的基本意思是through (通过），由此又引申出具有加强意义的throughout (贯穿），thoroughly(彻底），及含有贬义的to destruction (毁坏）等意思 (表示贬义的per-只出现在少数单词中）。per-是原生前缀，主要与拉丁动词词干结合，构成动词及其相应的名词或形容词。

以下介绍的是以per-开头的常见词。

perambulate [ per- = through 通过；ambulate = to walk 步行→]v. walk through; walk through and examine 步行穿过；巡行 / The king ordrered the musicians to perambulate the streets, playing lively melodies. 国王命令乐师们沿街道游行，演奏欢快的曲调。

perambulation n. 漫步；巡行；巡视 

perambulatory a. 漫步的；巡行的

perceive [ per- = thoroughly 彻底地；ceiv = to grasp 掌握；-e =>“to grasp thoroughly 彻底掌握”→]v. grasp or take in through the senses 发觉，察觉 / We perceived a little girl coining toward us. 我们察觉到有个小女孩正向我们走来。

perception n. 感觉；知觉；感性认识 

perceptive a. 知觉的；感觉灵敏的

perennial [per- = through 通过；enni = year 年；-al = being... 的→]a. lasting through the whole year 终年的 / The mountains are covered with perennial snow and ice. 山上覆盖着终年不化的冰雪。