1.pollen n．花粉(fine powder formed in flowers, which fertilizes other flowers when carried to them by the wind, insects, etc.)

例：Maize pollen is dispersed by the wind and frequently blows onto milkweed plants.

2.pollinate v.授粉，传粉(to make plants fertile with pollen)

词根记忆：pollin(花粉)+ate--授粉

例：Their flowers are pollinated by birds.

派生词：pollination(n．授粉)；pollinator(n．传粉媒介，传粉昆虫)

3.pollutant n．污染物(sth. that pollutes)

词根记忆：来自pollute(v.污染)

例：Nitrogen dioxide is a pollutant emitted by automobiles.

同根词：pollution(n．污染)

4.polygraph n．测谎器(lie detector)

词根记忆：poly（多，众）+graph(写，记录)--写得多的或从多方面记录的--测谎器

例：polygraph test测谎

5.population n．人口(the whole number of people or inhabitants in a country or region); 生物种群（the organisms inhabiting a particular locality）

词根记忆：popul(人，大众)+ation--人口

例：Hunters alone are blamed for the decline in Greenrock National Forest's deer population over the past ten years.

同根词：popularity(n.大众性；流行)

6.porcelain n．瓷；瓷器(china)

发音记忆：“跑四邻”--卖瓷器需要跑四邻八方

7.porpoise n．海豚(dolphin)

例：Environmentalists advocate the use of acoustic alarms as a means of protecting the harbor porpoise population.

8.portfolio n.文件夹(a hinged cover or flexible case for carrying loose papers, pictures, or pamphlets)；投资组合（如债券和股票）(the securities held by an investor)

例：Corporate officers and directors commonly buy and sell stocks in their own corporations for their own portfolios.

9.portrait n．肖像：相片(picture, photo)

联想记忆：por+trait(特点，特性)--描绘某人的特点--肖像

例：Most portrait studios use more color film than black-and-white film.