1.volatile a．易变的，多变的(characterized by or subject to rapid change)
词根记忆：volat(飞)+ile--飞来飞去的--多变的
例：volatile demand多变的需求
同根词：volant (a．飞行的；敏捷的)：volary(n．大型鸟舍)
2.volunteer n.志愿者(a person who voluntarily undertakes or expresses a willingness to undertake a service);a.自愿的(being, consisting of, or engaged in by volunteers)
词根记忆：volunt(志愿)+eer(人)--志愿者
例：We should disband our volunteer service and hire a commercial ambulance service.
同根词：benevolent(a．善心的，好意的)；volition(n．意志力)
3.voracious a．狼吞虎咽的(devouring or craving food in great quantities)；贪婪的(excessively eager; insatiable)
词根记忆：vor(吃)+acious--吃得多的--狼吞虎咽的
例：The survival of a rare New Zealand species of mistletoe is threatened both because its leaves are extremely tasty to a voracious opossum species and because its flowers are pollinated by two species of birds whose populations are in decline.
派生词：voraciously( ad.狼吞虎咽地；贪得无厌地)
4.vortices n．漩涡（vortex的复数）
例：Sunspots, vortices of gas associated with strong electromagnetic activity are visible.
5.vulnerable a．易受攻击的(capable of being physically wounded; assailable)
词根记忆：vulner(伤)+able--易受攻击的
例：The argument is most vulnerable to the objection.
派生词：vulnerably( ad.脆弱地；易受伤害地)；vulnerability(n.弱点；易损性)
6.wage v.发动（战争）(to engage in or carry on);n．工资(a payment, usually of money for labor or services, usually according to contract and on an hourly, daily, or piecework basis)
记：wage作为“工资”这一意思大家比较熟悉，可以理解为“为了工资而斗争”
例：Agricultural revenues in excess of the amount needed for subsistence were used by medieval kings to wage war.
7.wanton a．无节制的，放纵的(being without check or limitation);顽皮的(mischievous)
发音记忆：“顽童”--顽皮的
例：Customs inspectors are often treated not like government employees but wanton poachers by travelers.
8.warbler n．（能叫出柔和颤音的）鸣禽
例：Blue-winged warblers are unlike most species of warbler in which it is very difficult to tell the male and female apart.
9.warrior n．战士(a man engaged or experienced in warfare)
词根记忆：war(战争)+rior--战斗的人--战士
例：terracotta warriors秦始皇兵马俑