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1、Unit 4 Words and Expressionssystem n 系统；体系；制度 solar system 太阳系 religion n.宗教；宗教信仰economy n. 经济religious adj.宗教上的the economic system 经济体制violent adj.猛烈的；激烈的； violence n.暴力a violent reaction(反应）a violent attack(袭击）violent film/behavior(电影/行为）in time 及时；最终（经过一段时间后，迟早.)on time 按时 for the time being 暂时 k
2、ill time 消磨时间 take ones time 不着急，慢慢来at times 有时 at no time 绝不（位于句首，句子要半倒装）all the time 一直ahead of time 提前at the same time 同时in no time 立刻 马上eg: At no time can we give up our study.unlike prep. 与.不同；不像 unlikely adj.不太可能的 likely adj. 可能的 Its unlikely/likely that. .不可能的/可能的. be likely to do sth 有可能做某事e
3、g: Unlike her little brother, she is very confident.eg:It is that she will arrive here before seven. 她有可能（不可能）七点前这。 She is likely to come tomorrow. 她有可能明天来。harmful adj. 有害的 be harmful to 对.有害eg: Smoking is harmful to our health. 吸烟有害健康。harm n. 伤害，损害do harm to=do sb harm=harm sb 对某人有害does harm to mul
4、tiply（multiplied;multiplied)vi/vt. vi/vt. 增加；增加；vi/vt. vi/vt. 乘，乘， 乘以；乘以；vi/vt. vi/vt. 繁殖繁殖；Our problems have multiplied since last year.Wolves multiply rapidly.Multiply 5 and 6,and you will get 30 5 multiplied by 6 is 30.multi-表示表示“多个多个” 与其他与其他词构成词构成n/adj. multimedia 多媒体多媒体(的）的）exist vi.生存；生存生存；生存无
5、被动，无进行Keynote SpeakerPeople cannot exist without water. on 靠.生存/生活It is impossible for them to exist on a small income.existence n.生存=stop =stop .(.(fromfrom) ) =keep=keep.from from (from(from为介词，后加为介词，后加ing)ing)prevent (from).阻止；制止阻止；制止eg:I prevent him (from) going out.我阻止他出去puzzle LOREM IPSUM DOLO
6、Rn.难题，谜vt./vi 迷惑,使困惑His behavoir puzzled me.puzzle about/over 对.迷惑，苦苦思索She is puzzling about the strange leter.puzzlingpuzzledin return 作为回报LOREM IPSUM DOLORin ones turn 轮到某人Finally， he got the ticket in his turn.最后轮到他的时候他拿到了票in turn 依次，轮流；转而依次，轮流；转而by turns 轮流（多指两人轮流（多指两人/两者行为）两者行为）The girls called out their names in turn. 女孩子们依次报出自己的姓名。女孩子们依次报出自己的姓名。We did the work by turns. its ones turn to do sth.轮到某人做某事