1.prevalence n．流行：普遍(the quality or state of being prevalent)

词根记忆：来自prevalent(a．流行的，普遍的)

例：They underestimated the prevalence of child labor among the working classes.

2.prevalent a．流行的，普遍的(widespread)

联想记忆：pre(前)+VaI（力量）+ ent——有走在前面的力量——流行的

例：Hip-Hop is prevalent among teenagers these days.

派生词：prevalence(n.盛行)

3.preventive n．预防药(sth. used to prevent disease)；预防法(sth. that prevents);a．预防的，防止的(precautionary)

词根记忆：来自prevent(v.预防；阻止)

例：Employees at companies with on-site clinics seek preventive screening and are thus less likely to delay medical treatment.

4.previous a.前面的，在前的(earlier, coming before)

词根记忆：pre(前)+vi（路）+ous——前面的路——前面的，在前的

例：Previous studies have indicated that eating chocolate increases the likelihood of getting heart disease.

5.prey n.被掠食者(an animal taken by a predator as food);v.(on)捕食(to seize and devour as prey)

注意：pray(v.祈祷)

例：Some species of dolphins find their prey by echolocation.//Killer whales in the North Pacific usually prey on seals and sea lions.

6.priest n.牧师，神父(clergyman)

例：During the full moon, the priest chanted a special prayer.

7.primary a．最初的(primitive)；基础的(fundamental)；首要的(principal)

词根记忆：prim(第一)+ary(…的)——最初的

例：Sugar is the primary export of the country.

8.primate n.灵长类（动物）(any member of the most highly developed order of mammals that includes human beings apes and monkeys)

词根记忆：prim(第一)+ate——人类最初祖先——灵长类

例：Humans are the most advanced of all the primates.

9.primer n．识字课本(a small book for teaching children to read)；底漆，首涂油，打底剂(material used in priming a surface)

词根记忆：来自prime(n.初期：a．主要的；基本的)

例：A single layer of the new coating provides the aluminum skin of the airliner with less protection against corrosion than does a layer of primer of the usual thickness.

同根词：primitive(n．原始人；a．原始的)