【drop】
(1) to fall or let fall; (2) to go lower. * She dropped a book as she walked by him. (1) 她走过他旁边时掉了一本书。 * The value of the dollar dropped. (2) 美元价值下降（贬值）。
【drown】
to die under water. * Three hundred people drowned when the ferry boat sank. 当渡船沉没的时候，三百人淹死。 ferry boat：渡船，渡轮
【drug】
(1) anything used as a medicine or in making medicine; (2) a chemical substance used to ease pain or to affect the mind. * The new drug seems to be an effective weapon against infections. (1) 新药好像是预防传染病的一种有战斗力的武器。 * Some doctors say the illegal drug marijuana can reduce bad effects of treatment with anti-cancer chemicals. (2) 一些医生说非法药物大麻能减轻用于抗癌的化学药品的副作用。
【dry】
(1) not wet; (2) without rain. * This raincoat will keep you dry. (1) 这雨衣将使你保持干燥。 * The hot, dry weather is causing severe problems for farmers. (2) 炎热、干旱的天气正在对农民引起严重的问题。
【during】
(1) through the whole time; (2) while (something is happening). * She said she would be too busy during the day to see me. (1) 她说她在白天太忙不能看我。 * I slept during his long speech. (2) 在他的长时间的讲话期间我睡着了。
【dust】
pieces of matter so small that they can float in the air. * After the explosion, the air in the building was filled with dust. 爆炸之后，大楼里的空气充满了灰尘。 be filled with：充满着
【duty】
(1) one's job or responsibility; (2) what one must do because it is right and just. * The soldier was often on guard duty. (1) 士兵通常在站岗值班。 on guard：站岗 on duty：值班，上班 * It is my duty to vote on election day. (2) 选举日投票是我的义务。
【device】
a piece of equipment made for a special purpose. * The microwave cooker is a device I use every day. 这个微波炉是我每天使用的一个设备。
【dictator】
a ruler with complete power. * The people of Yugoslavia forced the dictator from power. 南斯拉夫的人民用武力把独裁者赶下了台。
【die】
(1) to become dead; (2) to stop living; (3) to end. * If you touch that wire you will die. (1) 如果你接触那电线你就会死。 * The river died slowly as pollution increased. (2) 当污染增加时，河流缓慢失去活力。 * All hope died when the prison gate closed. (3) 当监狱大门关闭的时候,所有的希望都结束了。
【diet】
usual daily food and drink. * The doctor ordered a special diet to help him lose weight. 医生安排一特殊饮食帮助他减轻体重。
【different】
not the same. * His clothes are different from mine. 他的衣服不同于我的。 be different from：与…不同
【difficult】
(1) not easy; (2) hard to do, make or carry out. * Keith was a difficult child. (1) 基思是一个难相处的孩子。 * Building a boat is a difficult job. (2) 建造一只小船是一个困难的工作。
【dig】
to make a hole in the ground. * Dig here and you will find water. 挖这里你会找到水。
【dinner】
(1) the main amount of food eaten at a usual time; (2) a special event that includes food. * The family had its dinner at noon. (1) 家人在中午吃正餐。 * The official dinner took place at the White House. (2) 官方的宴会在白宫进行。 take place：发生，举行
【diplomat】
a person who represents his or her government in dealing with another government. * Most foreign diplomats live in the Washington area. 大多数外国外交官居住在华盛顿地区。
【direct】
(1) to lead; (2) to aim or show the way；(3) straight to something; (4) not through some other person or thing. * The mayor directs all city agencies. (1) 市长指导全部的城市机构。 * He directed me to the theater. (2) 他指引我去剧院的路。 * The most direct way to Annapolis is Highway 50. (3) 去安纳波利斯的最直接的路是50高速公路。 * The path is direct. (4) 这条道路是径直的。
【direction】
(1) the way (east, west, north, south); (2) where someone or something came from or went to. * North is the opposite direction from south. (1) 北方是南方的相反的方向。 * The cold wind is coming from that direction. (2) 冷的风正来自那个方向。
【dirt】
earth or soil. * Little children enjoy playing in the dirt. 小孩子喜爱在泥土里玩。
【disappear】
(1) to become unseen; (2) to no longer exist. * His dog disappears when it is time for a bath. (1) 到洗澡的时间了，他的狗却不见了。 * Dinosaurs disappeared a long time ago. (2) 恐龙很久以前就消失了。
【disarm】
(1) to take away weapons; (2) to no longer keep weapons; (3) to make a bomb harmless by removing its exploding device. * The policeman disarmed the gunman. (1) 警察缴械持枪歹徒。 * Some smaller countries have disarmed. (2) 一些小国家已裁军。 * Explosives experts often can disarm bombs. (3) 爆破专家通常能够拆除炸弹。
【discover】
to find or learn something. * Scientists have discovered cures for many kinds of cancer. 科学家已经发现很多种癌症的疗法。
【discuss】
(1) to talk about; (2) to exchange ideas. * We can discuss anything you wish. (1) 我们可以讨论你希望的任何事情。 * The two presidents discussed trade and other economic issues. (2) 两位总统讨论贸易和其它经济上的问题。
【disease】
a sickness in living things, often caused by viruses, germs or bacteria. * Modern medicines have made some diseases disappear. 现代医学已经使一些疾病消失。
【dismiss】
(1) to send away; (2) to refuse to consider. * The scientist was dismissed for copying secret information about nuclear weapons. (1) 科学家因复制关于核武器的秘密信息而被解职。 dismiss for：因…而解雇或开除(某人) * The senators dismissed any idea of campaign finance reform. (2) 那些参议员摒除竞选资金改革的任何想法。
【dispute】
(1) to oppose strongly by argument; (2) an angry debate. * The two nations disputed where the border between them should be. (1) 两个国家争论在他们之间的边境应该在哪里。 * The United Nations helped settle the border dispute. (2) 联合国帮助解决边界争端。
【dissident】
a person who strongly disagrees with his or her government. * The three dissidents were sentenced to long prison terms. 3名持不同政见者被判处长期徒刑。 prison term：刑期
【distance】
the amount of space between two places or objects. * The distance from my house to your house is two kilometers. 从我的房子到你的房子的距离是二千米。
【dive】
to jump into water head first. * He dived into the river and swam to the screaming child. 他跳入这条河并且向尖声喊叫的孩子游去。
【divide】
to separate into two or more parts. * She divided the food into four equal amounts. 她把食品分成4 相等的份数。
【do】
(1) to act; (2) to make an effort. * I did the job exactly as ordered. (1) 我准确地按照预先安排的来做工作。 * He did the best that he could do. (2) 他尽力做的最好。
【doctor】
a person trained in medicine to treat sick people. * He was sick so he went to see the doctor. 他生病了，所以他去看医生。
【document】
an official piece of paper with facts written on it, used as proof or support of something. * The lawyer offered many documents to support his case. 律师提供很多文件支持他的案件。 to support：赞成，支持
【dog】
a small animal that often lives with humans. * Our dog loves to chase our cat. 我们的狗喜欢追我们的猫。
【dollar】
United States money, one hundred cents. * Could I borrow a dollar from you? 我能向你借一美元吗？
【door】
an opening for entering or leaving a building or room. * He ran through the door just as she closed it. 她刚把门关上时，他越门跑了。
【down】
(1) from higher to lower; (2) in a low place. * The climbers walked down the mountain. (1) 那些登山运动员走下山。 * I was doing some exercises down on the floor when she walked in. (2) 她进来时我正在地板上做锻炼。
【dream】
(1) to have a picture or story in the mind during sleep; (2) a picture or story in the mind during sleep; (3) a happy idea about the future. * He dreamed he was standing on a falling building. (1) 他梦见他正站在一座倒下的大楼上。 * The man described his dream to the psychiatrist. (2) 那个人把他的梦描述给精神病医生。 * The civil rights leader had a dream that someday whites and blacks could live together in peace. (3) 民权领袖有个梦想，希望有一天白人和黑人能和平共处。
【drink】
to take liquid into the body through the mouth. * I always drink water after running. 我在跑步之后总是喝水。
【drive】
to control a moving vehicle. * He is learning to drive a car. 他学习开车。