核心词汇stroke n. ○1意外的一桩（幸事、运气或不幸）○2中风○3笔划○4抚摸○5v.抚摸【例句】In a stroke of luck, a suitable organ donor became available.运气的话也会有合适的器官捐献者。
Various strokes of misfortune led to his ruin.遭诸多不幸使他一蹶不振。
The funeral of Mr. Whitelaw, who died of a stroke, willgo ahead as planned today. 怀特劳先生死于中风，他的葬礼按计划今天举行。
The character“繁”has too many strokes and childrenfind it very difficult to write. “繁”这个字笔画太多，孩子们觉得很难写。
Cats like being stroked. 猫喜欢让人抚摸。
collide vi.○1互撞，碰撞○2严重冲突，抵触【例句】The two planes collided with each other in midair and over 100 people were killed. 两班飞机在空中相撞,一百多人丧生。
I ran around the corner, and almost collided with Mrs Laurence.我从拐角跑过去，差点与劳伦斯夫人撞上了。
The President has again collided with Congress over his budget plans.总统在他的预算计划上又与国会意见冲突了。
【派生】collision n.碰撞，互撞；冲突insist v.○1坚决要求○2坚决认为，宣称【例句】The victim’s relatives insisted on immediate repayment.受害者亲属要求立即得到偿还。
The man insisted on helping me find a taxi even though Itold him I didn’t need any help.即便我说了我不需要帮助，那人还是坚持要帮助我找一辆的士。
My parents insist we (should) report the matter to thepolice right away.我父母坚持要我们立即把此事向警方报告。
The suspect insisted on his innocence.犯罪嫌疑人坚持说自己是无罪的。
【搭配】insist on one’s idea 坚持自己的观点insist on doing sth. 坚持(要)做某事insist + that clause 坚持，坚决要求…【辨析】persist in doing sth. 坚持/持续做某事, 表示持之以恒做某事、固执、不放弃；而insist on doing sth 却表示坚持一个观点，坚持要做某事。
例如：We mustpersist in taking the socialist road of Chinesecharacteristics. 我们必须坚持继续走中国特色的社会主义道路。
【派生】insistence n. 坚决要求，坚决主张insistent a. 坚持的，执拗的guilt n. ○1内疚，悔恨○2罪过，责任，过失○3罪，罪行【例句】Don’t you have any feelings of guilt about leaving David?你离开大卫不感到内疚吗？When children behave badly the guilt sometimes lieswith the parents for not caring sufficiently. 孩子行为不轨责任有时在于父母关心不够。
At the court he made no attempt to deny his guilt.法庭上他没有想否认自己的罪行。
【搭配】admit / confess one’s quilt 认罪；承认自己的过失或责任【派生】guilty a.○1感到内疚/惭愧的，自责的○2应（对道德败坏、社会唾弃的行为）负责的○3有罪的，犯罪的depressed a. sad or gloomy忧伤的，抑郁的，消沉的【例句】I need something to occupy my mind. I get depressed if I have nothing to do.我需要事情占据脑子，一没事我就会郁闷。
【派生】depress v. 使感到消沉，使沮丧depressing a.令人沮丧的，令人消沉的depression n . 沮丧，愁苦，抑郁，失望情绪suicidal a.自杀的，有自杀倾向的【例句】He suffered periods of deep depression, when his mood became suicidal.他经历了几次严重的抑郁，情绪到了要自杀的状态。
For many years before treatment, Clare had suicidaltendencies (= behaviour that showed she wanted to killherself).在接受治疗之前的几年里，克莱尔一直有自杀的倾向。
【派生】suicide n.自杀to commit suicide自杀; suicide bombing attack自杀性炸弹袭击striking a. very attractive or impressive 引人注目的，显著的，惊人的【例句】There were some striking similarities between the two books.这两本书有惊人的相似之处。
Tom was always impressed by the striking resemblancebetween his Uncle Julian and his father.那时汤姆总是对叔叔朱丽安和父亲的惊人相似留有深刻的印象。
【派生】strike v.有强烈的感受，造成深刻的印象strike sb as + adj. 给某人留下什么印象threaten v.○1预示（不好的事），有…之势，（不好的事）即将来临，逼近○2威胁【例句】Dark clouds threatened rain.乌云预示着有雨。
According to some scientists, global warming threatensthe survival of the whole human race. 有些科学家认为，全球变暖威胁着整个人类的生存。
The kidnapper threatened to kill me if I didn’t obey.绑架者威胁说如果我不听从就要杀了我。
The man became angry and threatened that he would go to the police.那个人生气了，威胁说要去警察局。
【用法】threaten sb/sth 威胁某人/ 预示什么事可能发生threaten to do sth.威胁（说）去做某事；threaten that clause 威胁要做某事【派生】threat n. ○1凶兆，坏兆头○2威胁，恐吓○3可能带来危险的人或事物slip v.○1溜走，悄悄移动○2滑，溜，滑倒，失足【例句】The thief slipped into the room when no one was looking.没人注意的时候，那个贼溜进了房间。
As the years slipped by, I thought less about her.随着时间的流失，我不那么想她了。
The road was frozen, and people were slipping andsliding all along the street.路面上冻了，沿路上人们都在打滑摔倒。
【近义】英语中表示“不被人注意溜进一个地方”的词除了slip之外，还有：○1 slide 悄悄地走、徐徐地行如：slide out of the room (悄悄溜出房间)；○2sneak偷偷地走，潜行，如： sneak aboard theplane/ ship 偷偷登上飞机/轮船。
○3steal into悄悄、偷偷地溜进，如：steal away from the team（偷偷溜出队伍）。
given prep.倘若，如果考虑到，鉴于【例句】Given their inexperience, they’ve done a good job.考虑到他们没有经验，这个工作做得已经不错了。
Given that the patients have some disabilities, we are thinking of moving to live together with them. 鉴于父母有残疾在身，我们考虑要搬过去和他们一起住。
console v. 安慰，抚慰，慰问【例句】Susanna did her best to console her daughter by promising to buy her another doll.苏珊娜尽力安慰女儿，答应说再给她买一个娃娃。
He consoled himself that he would see Kate again soon.她安慰自己说很快就会再见到凯特的。
【派生】consolation n. 安慰，慰问tolerate / v.○1宽容，容忍○2忍受【例句】The dean is always advocating open-mindedness, actually he refuses to tolerate any opposition. 主任总是提倡思想解放，而事实上他不能容忍任何反对意见。
For years the workers have had to tolerate low wages and terrible working conditions.多年来工人们一直不得不忍受低工资和恶劣的工作条件。
【搭配】to be tolerant of ( or, towards ) sth. / sb. 对某事或某人宽容/ 忍受lack of tolerance of / for / towards 缺乏对某事或某人的忍受【派生】tolerant a. 宽容的tolerance n. 宽容；忍受（力）diagnostic / a. of or for diagnosing 诊断的【例句】Doctors depend more and more on accurate diagnostic tools.医生越来越多地依赖精确的诊断工具。