1.mural n.壁画(a very large image, such as a painting or an enlarged photo- graph, applied directly to a wall or ceiling)
词根记忆：mur(墙)+aI--墙上的画--壁画
例：Margaret has traveled to photograph the art of Ndebele women, whose murals are brilliantly colored.
同根词：demur(v.反对)；immure(v.监禁)
2.mutation n．突变，变异(a significant and basic change)
词根记忆：mut（变）+ation--突变，变异
例：Genetic mutations in bacteria and viruses can lead to epidemics.
同根词：immutable(a不可变的)
3.mutual a．相互的(directed and received in equal amount)；共同的(possessed in common)
词根记忆：mut(变)+ual--改变是相互作用的结果--相互的；共同的
例：mutual fund共有基金（一种投资公司形式）
4.mystic a．神秘的(mysterious; strange)：神秘主义的(of or relating to mysticism)；神秘主义者(one who practices or believes in mysticism or a given form of mysticism)
词根记忆：myst(神秘)+ic--神秘的；神秘主义的
例：The mystic writing on the wall could not be understood by anyone.// This most bland and circumspect of men was a mystic in both public and private life.
5.mythic a．虚构的(fancied)；神话（般）的(of or relating to the myth)
词根记忆：myth(神话)+ic--神话（般）的
例：The downsizings mythic properties give the company added prestige in the business community.
6.mythology n.神话(a body of myths concerning an individual event, or institution); 神话学(the field of scholarship dealing with the systematic collection and study of myths)
词根记忆：myth(神话)+ology(学)--神话：神话学
例：The classical scholar specialized in Greek mythology.
派生词：mythological(a．神话学的)
7.narrative a．叙述的，讲故事的( of, or in the form of story-telling)；导航
词根记忆：来自narrate(v.叙述)
例：narrative device叙事手法
同根词：narration(n．叙述，讲述)
8.naturalize v．使（外国人）入籍(to admit to citizenship)
例：Each newly natural/zed citizen was issued a social security number.
9.navigation n.航行，航海(the act or practice of navigating)；导航
词根记忆：nav(船)+ig+ation(行为；状态)--开船--航海
例：For some birds the sense of smell appears to play a role in navigation.
同根词：naval(a．船的；海军的)
10.navlv n.海军(a nations ships of war and of logistic support)
词根记忆：nav(船)+y--驾驶舰船保卫祖国--海军
例：Most of the opposition to the bill came from the Navy and its numerous civilian spokesmen.
同根词：naval(a．海军的)；navigate(让航行)；navigation(n．航行)
11.nebula n．星云（any of numerous clouds of gas or dust in interstellar space)
例：galactic nebula银河星云
12.necessitate v.需要(to need, to require)；（使）成为必要(to make necessary)
词根记忆：necessit(需要)+ate--需要；（使）成为必要
例：The reduction in government revenues will necessitate cuts in other government programs.
派生词：necessity(n.必需品：必要性)
13.needy a．贫穷的(poverty-stricken)
联想记忆：need(需要)+y(…的)--什么都需要的--贫穷的
例：The church distributes food and clothing to needy people.
14.negative a．否定的(marked by denial);消极的(passive)；负的(minus)
词根记忆：neg(否定)+atiVe(…的)--否定的
注意：positive(a．肯定的)
例：negative evaluation否定性的评价//negative impact消极的影响// negative number负数