50课distinguish v. 区分，辨别，分清Could he distinguish right from wrong?... 他能分辨是非吗？district n.. 区，地区，区域I drove around the business district. 我开车在商业区转了转。

division n. （算术用语）除I taught my daughter how to do division at the age of six.女儿6岁时我就教她如何做除法了。

doubt n. & v.怀疑；疑惑This raises doubts about the point of advertising..这对做广告的意义提出了疑问。

No one doubted his ability... 没有人怀疑他的能力。

disturb vt. 扰乱，打扰I hope I'm not disturbing you. 我希望没有打扰到你。

He had been disturbed by the news of the attack on Hector Coyne.赫克托·科因受袭的消息让他焦虑不安。

dive vi. 跳水He tried to escape by diving into a river...他企图跳入河中逃跑。

Joanne had just learnt to dive.乔安妮刚学会跳水。

divide vt. 分，划分It will be easiest if we divide them into groups...如果我们将他们分成小组将是最简单的。

dormitory n.（学校等的）宿舍She lived in a college dormitory.她住在大学宿舍里。

51课dozen n. 十二个，几十，许多He ordered a dozen of their best red roses..他订购了12朵他们那儿最好的红玫瑰。

I was sitting only a dozen feet away... 我正坐在只有十几英尺远的地方。

drag v. 拖，拽He got up and dragged his chair towards the table. 他站起来把他的椅子拖向桌子。

I've been dragged back from Australia for no sufficient reason.没有充分的理由，我就从澳大利亚被硬叫了回来。

draft n. & v. 草稿，草案；起草，草拟I faxed a first draft of this article to him.我将这篇文章的初稿传真给他了。

He drafted a standard letter to the editors...他起草了一份给编辑的标准信函。

52课dull a. 单调无味，阴暗They are both nice people but can be rather dull... 他俩都是好人但非常沉闷。

drug n. 药，药物，毒品The drug will be useful to hundreds of thousands of infected people.这种药将惠及成千上万的感染者。

She was sure Leo was taking drugs...她确定利奥在吸毒。

53课effective adj.有效的The project looks at how we could be more effective in encouraging students to enter teacher training.该项目着眼于我们如何能够更加有效地鼓励学生参与教师培训。

ease v. 减轻，缓解（难度或严重程度）I gave him some brandy to ease the pain.我给他喝了些白兰地以减轻疼痛。

The heavily falling snow had eased...漫天大雪变小了。

effort n. 努力He made no effort to hide his disappointment...他毫不掩饰失望之情。

With an effort she contained her irritation.她努力强压住了怒火。

editor n.编辑，编者Were you the editor of elle magazine? 你是elle杂志的编辑吗？elegant 文雅的，漂亮的，精美的Patricia looked beautiful and elegant as always.帕特里夏一如既往地美丽优雅。

element n. 成分，要素，元素Fitness has now become an important element in our lives.现在健康已经成为我们生活中的一个要素。

embassy n. 大使馆Gaston will take you to the embassy. 加斯顿会送你回大使馆elect vt.（投票）选举The people of the Philippines have voted to elect a new president...菲律宾人民已投票选举出了一位新总统。

emotion n.情感，感情；情绪Her voice trembled with emotion. 她的声音因情绪激动而颤抖。

You know, jealousy is a really ugly emotion. 你知道,嫉妒是一种非常丑恶的感情.empire n.帝国The incan empire fell quickly 1533. 印加帝国在1533年迅速垮台。

employ vt.雇用Farms often employ many temporary workers.农场经常雇用临时工。

empathy n.<心>移情作用；同感，共鸣Having begun my life in a children's home I have great empathy with the little ones.由于从小生活在儿童院，我对小家伙们产生了强烈的共鸣。

enemy n.敌人；敌军The enemy were pursued for two miles...敌军被追击了两英里。

energetic adj.精力旺盛的Ten year-olds are incredibly energetic.10岁的孩子精力格外旺盛。

energy n.[物]能量；活力；精力At 54 years old her energy and looks are magnificent...她54岁了，精力和气色都非常好。

She had started to devote her energies to teaching rather than performing... 她已经开始将精力从表演转移到教学中。

enlarge vt.& vi.扩大the plan to enlarge Ewood Park into a 30,000 all-seater stadium...将伊伍德公园球场扩建成能容纳3万座席的体育场的计划enquiry n.询问An enquiry will be conducted into the whole affair.将对全案展开调查。

enthusiastic adj.热心的；热情的Tom was very enthusiastic about the place...汤姆对那个地方非常感兴趣。

He knew much about pictures and fine furniture, and was an enthusiastic gardener. 他对电影和高档家具知之甚多，还是个园艺爱好者。

entire adj.全部的；整个的He had spent his entire life in China as a doctor...他一生都在中国当医生。

entertain vt.热情款待；使有兴趣；娱乐I don't like to entertain guests anymore...我再也不想招待客人了。

They were entertained by top singers, dancers and celebrities...顶级歌手、舞蹈演员和名人们给他们带来娱乐。

56课.equip vt.提供设备，装备，配备The country did not possess the modern guns to equip the reserve army properly.该国没有现代枪炮来给预备役部队提供适当装备。

They can't afford to equip their army properly.他们无力充分装备自己的军队。

error n.错误；差错NASA discovered a mathematical error in its calculations...美国国家航空航天局在它的计算结果中发现了一个数学错误evident adj.清楚的，显而易见的His footprints were clearly evident in the heavy dust。

厚厚的尘土中他的脚印清晰易见。

It's evident that you're been drinking.你显然一直在喝酒。

evidence n.证据，证明To date there is no evidence to support this theory.到目前为止，还没有证据支持这种理论。

examine vt.检查，诊察He examined her passport and stamped it...他仔细检查了她的护照，然后在上面盖了章。

Another doctor examined her and could still find nothing wrong... 另外一名医生对她进行了诊察，仍旧没有发现任何问题。

57课essentialIt was absolutely essential to separate crops from the areas that animals used as pasture...将庄稼和放牧区分开绝对必要。

The flat contained the basic essentials for bachelor life.那套公寓配有单身生活的基本必需品。