Group 22 Per-though, thoroughly
“贯穿；彻底地”
perforate
vt. 刺穿；打孔　
The surgeon said the tack had gone through Betty's shoe and sock without perforating her skin.
医生说大头钉穿过贝蒂的鞋袜，但未刺伤她的皮肤。
permeate
vt. 弥漫；透过　
At breakfast the aroma of freshly brewed coffee permeates the kitchen and dining room.
吃早餐时刚泡好咖啡的香味弥漫整个厨房与饭厅。
perplex
vt. 困惑；混乱　
I need help with the fourth problem; it perplexes me.
我需要人帮我解第四题；它使我困惑。
persist
vt. 1. 固执不改 2. 待续　
The teacher told Eric to stop whispering. When he persisted she sent him to the dean.
老师叫艾立克不要说悄悄话，当他依旧我行我素时，老师就送他到教务处。
The rain was supposed to end in the morning, but it persisted through the afternoon and evening.
雨应该在早上停的，却持续下了一个下午及晚上。
perturb
vt. 使不安；扰乱　
Maggie's parents were perturbed when they learned she had failed two subjects.
麦姬的父母知道她两科不及格时感到很不安。
perennial
1. adj. 永久的 2. n. 多年生植物　
Authors have come and gone, but Shakespeare has remained a perennial favorite.
作家们昙花一现般地来了又走，只有莎士比亚成为人们永久的喜好。
Perennials like the azalea and forsythia bloom year after year.
多年生的植物如杜鹃、连翘一年接一年地开花。
pertinent
adj. 有关的；贴切的　
Stick to the point;don't give information that is not pertinent.
坚守主题；不要扯一些不相关的事。