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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 kil
2、l 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.timeunlike 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eg:Unli
3、ke 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 multiply（multiplied
4、;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构成n/adj.multimedia 多媒体多媒体(的）的）exist vi.生存；生存生存；生存无被动，无进行Keynote SpeakerPeopl
5、e 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 DOLORn.难题，谜vt./vi 迷惑,使困惑His behavoir puz
6、zled 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，依次，轮流；流；转而而by turns 轮流（多指两人流（多指两人/两者行两者行为）The girls called out their names in turn.女孩子女孩子们依次依次报出自己的姓名。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