1.permeate v.扩散(to spread or diffuse through)；渗透(to penetrate)

词根记忆：per(全部)+mea(通过)+te--全通过--渗透

例：Neutrinos(微中子)are another form of radiation that permeates the universe.

2.permissive a．许可的（granting or inclined to grant permission；tolerant or lenient）；过分纵容的(indulgent)

词根记忆：来自permit(v.许可，允许)

例：permissive terms许可条款

派生词：permissively( ad.许可地；自由地)

同根词：submissive(a.顺从的)

3.permit v.允许，许可(to allow);n.通行证，许可证(a written warrant or license granted by one having authority)

词根记忆：per(全部)+mit(送，放出)--全部放出--通行证

例：Personality development is hindered if a person is not permitted to be independent.

派生词：permission(n．许可，允许)

4.pernicious a．有害的(highly injurious)；致命的(deadly)

词根记忆：per(全部)+nic(毒)+ious--有毒的--有害的：致命的

例：The sustained massive use of pesticides in farming has two side effects that are especially pernicious.

5.perpendicular a．垂直的(vertical, exactly upright);n.垂线(a line at right angles to a line or plane)

词根记忆：per(自始至终)+pend(挂)+icular--自始至终挂着--垂直的

例：A ladder 25 feet long is leaning against a wall that is perpendicular to level ground.

6.perpetrator n.作恶者(a person who does sth. considered outrageous);犯罪者(criminal)

词根记忆：来自perpetrate(y．犯罪)

例：The perpetrators are in effect told that they are not responsible for their actions.

同根词：petrify(v.石化，僵化)

7.perpetuate v.延长…的存在，使永记不忘(to cause to last indefinitely)

词根记忆：per(自始至终)+pet(追求)+uate--永远追求--永记不忘

例：The myth is perpetuated by the compensation consulting industry.

8.perplex v.使（某人）困惑(to puzzle)；（使）复杂化(to make intricate)

词根记忆：per(全部)+plex(重叠)--全部重叠在一起--困惑

例：The difficult math problem perplexed the students.

派生词：perplexed(a.困惑的)

9.persecute v.迫害(to oppress cruelly)

词根记忆：per(始终)+secu(跟随)+te--从头到尾跟随--迫害

例：The two parties disprove the theory of the other, but unite in persecuting the dissenters.