1.proportional a．(to)成比例的：均衡的(corresponding in size degree, or intensity)
例：The drugs' effectiveness against pain is proportional to their success in blocking this enzyme at the site of injury.
派生词：proportionally( ad.按比例地)

2.proprietary a．所有的，私人拥有的(of relating to, or characteristic of a proprietor)
词根记忆：propri(本身所有的)+etary——所有的
例：proprietary rights所有权

3.prorate v.<美>按比例分配( to divide or distribute proportionately)
词根记忆：pro(赞成)+rate(比率)——按比例分配
例：prorate dividends按比例分红

4.prose n.散文(written or spoken language that is not in verse form)
联想记忆：p+rose(玫瑰)——散文如玫瑰花瓣，形教而神聚
例：Victorian women did write the first-rate prose and poetry.
派生词：prosaic(a．散文的)

5.prosecute v.对…提起公诉(to bring legal action against for redress or punishment of a crime or violation of law)
例：Few individuals are prosecuted for violating gun control laws.
派生词：prosecution(n．起诉；经营)

6.prosecutor n.检察官(a public official who charges sb. officially with a crime and prosecutes them in court)；起诉人，原告(a person who institutes an official prosecution before a court)
联想记忆：pro（前）+secu（追随）+tor（人）——追随你到法院门前的人——起诉人
例：Chief Public Prosecutor 首席检察官

7.prospoct n.前景：期望(anticipation)
词根记忆：pro（向前）+spect（看）——向前看——前景；期望
例：Undergraduates choose their major field primarily based on their perception of job prospects in that field．
派生词：prospecting（n．勘探）

8.prospective n．预期，展望(anticipation)；a．未来的：预期的(relating to or effective in the future)
词根记忆：pro（向前）+spect（看）+ive——向前看的——未来的；预期的
例：The following appeared in a letter to prospective students from the admissions office at Plateau College.
派生词：prospectively( ad.盼望中)
同根词：spectator(n.观众，旁观者)

9.prosper v.兴隆(to thrive)；成功(to succeed)
词根记忆：pro(在前)+sper(希望)——希望在前——兴隆；成功
例：When people have a personal stake in something, they think about it, care about it , work to make it prosper.
派生词：prosperous(a．繁荣富强的)