1.plummet v.（价格等）骤然下跌(to drop sharply and abruptly)

记：plummet愿意为“测深锤”

例：The value of the stock plummeted.

同根词：plumbing(n．铅工业)

2.plunge v.骤降（to descend suddenly）；跳进(to jump into)

例：The stock's value plunged.

派生词：plunging(a．突进的)

3.plywood n.胶合板(a structural material consisting of sheets of wood glued or cemented together with the grains of adjacent layers arranged at right angles or at a wide angle)

词根记忆：pIy（重叠）+wood(木)--重叠起来的木板--胶合板

例：Pressboard is an inexpensive new plywood substitute now often used in the construction of houses.

4.pneumonia n．肺炎(serious illness with inflammation of one or both lungs, causing difficulty in breathing)

词根记忆：pneumon(肺)+ia(病)--肺部的病--肺炎

例：A new study shows that toothbrushes can become contaminated with bacteria that cause pneumonia.

5.pneumonic a．肺的（of, relating to, or affecting the lungs）；肺炎的(of, relating to, or affected with pneumonia)

例：In 1616-1619, pneumonic plague swept coastal New England, killing as many as nine out of ten.

6.poach v.偷猎(to take game or hunt illegally)；水煮(to cook in simmering liquid)

例：Researchers have determined that, because of poaching and increased cultivation in their native habitats, there are fewer than 100 Arabian leopards left in the wild, and that these leopards are thus many times more rare than China's giant pandas.

派生词：poacher(n．偷猎者)

7.poacher n．偷猎者( one who kills or takes wild animals illegally)

词根记忆：来自poach(v.偷猎)

例：The Wildlife Protection Committee plans to protect selected rhinoceroses(犀牛)from being killed by poachers.

8.polar a．地极的(of or relating to the South or North Pole)

例：polar regions极地

派生词：polarize(v.两极分化)

9.poll n．民意测验(survey of public opinion by putting questions to a representative selection of people)

例：Most of the respondents in a recent poll said they believed that the economy is likely to continue to improve.