1、Book 3 Unit 4重点单词精讲1. system n. 系统，体系，制度，方法【例句】 The computer system broke down. What are the differences between the American and British systems of govern-ment?The teacher has a special system of teaching chemistry.2. theory n. 学说，理论【例句】 Einstein put forward his new theory of relativity. The plans
2、are good in theory, but they wont work in practice. 【妙语巧记】 Practice is better than theory. 行动胜于空谈。3. violent adj. 剧烈的，强烈的，凶暴的，暴力的【例句】 The boat sank in a violent storm at sea. The madman was violent and had to be locked up. Children should not be allowed to watch violent movies.【拓展】 violence n. 暴力，(感
3、情) 狂热；violently adv. 剧烈地，强烈地，使用暴力地【妙语巧记】 Violent fires soon burn out. 野火烧不尽，春风吹又生。Nothing good ever comes of violence. 暴力之树不结善果。4. unlike adj. 不同的，不相似的；prep. 不像，和不同【例句】 They are so unlike that nobody would believe they were sisters. Unlike his little brother, he has a good sense of humor.【拓展】 like p
4、rep. 像，如同；unlikely adj. 不大可能发生的；alike adj. 相似的，同样的；Its unlike sb to do sth 做某事不像某人的作风【妙语巧记】 The sun shines upon all alike. 太阳照人，不分贵贱。 Great minds think alike!英雄所见略同！ 5. harmful adj. 有害的【例句】 It is harmful to your health to drink too much. Much of the waste is harmful. 【拓展】 harmfully adv. 有害地；harmless
5、 adj. 无害的；harm n. v. 伤害，损害；be harmful to = do harm to 对有害【妙语巧记】 Far from home is near to harm. 龙游浅水遭虾戏，虎落平阳被犬欺。6. exist vi. 存在；(尤指在困境或贫困中) 生存【例句】 The Roman Empire existed for several centuries. Man cannot exist without air.【拓展】 existing adj. 现存的；existence n. 存在，生活方式；exist on依靠生存；come onto existence
6、存在【易混词】 exit n. 出口，退出7. puzzle n. 谜语，智力游戏，难题，不解之谜； v. (使) 迷惑【例句】 Can you figure out this puzzle? This is really a puzzle to me. His behavior yesterday puzzled me for a long time.【拓展】 puzzled adj. 困惑的，迷惑的；puzzling adj. 令人困惑的，令人费解的；puzzlement n. 困惑，疑惑；in puzzle-ment 疑惑地，迷惑地；puzzle over / about sth 苦苦思索某事；puzzle sth out 琢磨出的答案8. pull n. 拉，拉力，牵引力；vt. 拖，拉，扯，拽【例句】 Mark gave a quick pull on the rope. Pull open your table, please. 【拓展】 pull back (士兵)撤退；pull down 推倒，拆掉；pull in(= pull into the station) (火车等)进站；pull on (尤指迅速地)穿上，戴上【联想】 push n. vt. 推，推开【妙语巧记】 Pull the chestnut out of fire. 火中取栗。
