perfect [ per- = thoroughly 彻底；feet = to make or do 做=>“made or done thoroughly 做得彻底完全” →]I a. having no faults; without defect 尽善尽美；完整无误 / Perfect work shows great care. 工欲尽善，心必专一。II v. make perfect; improve 使完善；改善 / The poet is perfecting his poems. 诗人正在锤炼他的诗句。

perfection n. 尽善尽善；圆满成熟 

perfectible a. 可完成的；可改善的

perform [ per-=thoroughly 彻底地；form=to finish 做好 v. fulfil; carry out履行，完成 /One should perform what he Has promised. —个人应履行自己的诺言。

performance n. 履行，完成；功绩；演出 

performable a. 可执行的；可完成的

permanent [per-=through 经过；man = to stay 停留；-ent = -ing“staying through a long time 长期保留着的”→] a. lasting; intended to last 永久的；持久的 / After doing odd jobs for a week, he got a permanent position in the store.干了一周的杂工后，他在那家商店得到一份固定的工作。

permanency n. 永久的事物；永久的职位

permit [ per- = through 通过；mit = to send 发送=>“to send sb. through 让某人通过”→]v. allow (sb. ) to do sth. ; give leave to 允许；许可 / Most parents will not permit their young children to stay up late.多数父母不让小孩子晚上睡觉很晚。

permission n. 允许，许可，同意 

permissive a. 容许的，许可的；随意的

persist [ per- = thoroughly 彻底地；sist = to stand =>“to stand thoroughly 始终站稳”→]v. stick to it; continue firmly 坚持；固执 / She persisted in reading newspaper at the dinner table. 她总是在吃饭时看报纸。

persistence n. 坚持，固执；持续，存留 

persistent a. 坚持的，固执的；持续的