Unit 9 Lesson 3 课文重点讲解（ppt课件）-2023新北师大版（2019）《高中英语》选择性必修第三册.pptx

1、Unit 9 Human BiologyLesson 3 Eqidemics Explained老师:xxx课型：阅读课An epidemic is the name given to an infectious disease that rapidly spreads to a large number of people within a short period of timeusually two weeks or less.Epidemics have been happening for as long as there have been people living on Ear

2、th.They can be caused by several different 短时间短时间大量大量that引导定语从句引导定语从句只要只要在地球上在地球上 factors,such as a virus being carried into an area,or changes in the way people live,like more people living in an area,which increases the chances of them coming into contact with a bacteria or virus.例如例如which引导非限制性定语

3、从句引导非限制性定语从句come into contact with 接触到接触到 流行病(epidemic)是指在短时间内(通常两周或更短)迅速在大量人群中传播的传染性疾病。自地球上有人类生活以来，流行病就一直存在。它们会由不同因素(factor)引起，例如病毒(virus)被带入某个地区，或者由于人们生活方式的改变，比如说某一地区居住的人群增多，从而增加了接触病毒或细菌(bacteria)的几率。Each disease can only officially be classified as an epidemic once a certain number of deaths have

4、 occurred from the disease.The number of deaths is different for every disease.So a very rare disease will have a low baseline and just a few cases of it in one place will be 一定数量一定数量be different for与与.不同不同.的数字的数字/量量be classified as被归类为被归类为once引导时间状语从句引导时间状语从句classified as an epidemic;as opposed to

5、more common diseases,such as the flu,that have a higher baseline.The common cold is a widespread virus that affects millions of people,but it is not seen as being a serious enough condition to deserve the classification of epidemic.数百万数百万that引导的定语从句引导的定语从句be seen as 被看作被看作as opposed to与与截然相反截然相反 只有致

6、死病例达到一定数量，某种疾病才会被正式(officially)定性(classify)为流行病。每种疾病的死亡数量各不相同。罕见(rare)疾病的基线(baseline)很低，即使某一地区只出现少数病例，也会被认定为流行病；与此相反(opposed)，常见疾病的基线较高，如流感。普通感冒由一种广泛传播的(widespread)病毒引起，可感染数百万人，但它并没严重到可以被称为(classification)流行病。With recent press reports drawing parallels between bird flu and killer epidemics of the pa

7、st,Jim Smith looks at the sometimes depressing history of epidemics for clues about how we can create a more positive future without epidemics.draw parallels between.and.将将和和相提并论相提并论媒体报道媒体报道how引导的宾语从句引导的宾语从句 创造一个更积极创造一个更积极/美好的未来美好的未来 最近有新闻报道，吉姆史密斯将禽流感和过去致命的流行病做对比(parallel)，在屡屡令人感到沮丧的(depressing)流行病史

8、中寻找线索，从而创造一个远离流行病的美好未来。Since bird flu first appeared in 1997,it has taken more than a hundred lives.Many people fear it could be the next global epidemic,especially as scientists who have gone into detail studying tissue samples from the bodies of people who died of the 1918 Spanish Flu have proved

9、that bird flu is a modern adaptation of that virus.go into detail 详述，详细叙述详述，详细叙述超过超过死于死于.禽流感自1997年首次出现以来，已经夺去了一百多人的生命。尤其是当科学家们仔细研究了1918年西班牙流感死亡者尸体的组织样本(sample)，证明禽流感是该病毒的现代变异版本，许多人担心它可能会引起下一场全球流行病。One of the earliest epidemics on record happened between about 500 and 550 CE.Scientists now estimate t

10、hat up to 50%of the areas population died from the epidemic,making it one of the main causes of the fall of the Roman Empire.Then,in the 1330s,this epidemic up to 多达；由多达；由决定决定在在.和和.之间之间之一之一on record记录在案的记录在案的死于死于.in+the+年份年份s 表示年代表示年代现在分词短语作结果状语现在分词短语作结果状语returned,this time in Asia.It spread rapidly

11、 to Europe and became known as“The Black Death”because one visible symptom was black spots on the body.蔓延到蔓延到被认为是；叫做被认为是；叫做 人类有记载的最早的流行病，大约发生在公元(CE)500年至550年之间。现今科学家们估计(estimate)发病区域多达50%的人口死于这一流行病，成为罗马帝国衰落的一个主要原因。接着，14世纪30年代，这一流行病卷土重来，这次发生在亚洲，并迅速传播到欧洲。由于患者身上会出现明显的(visible)黑斑症状(symptom)，这种流行病被称为“黑死病

12、”。Centuries later,the Great Flu Epidemic of 1918,also called the Spanish Flu,struck near the end of World War.Families who had only just got through the war now had to bury their loved ones who had died of the disease.As a result of the war,more people were travelling and moving perhaps than ever be

13、fore in history and this caused the who引导的引导的定定语从句语从句由于；作为由于；作为的结果的结果than ever before比以往任何时候更比以往任何时候更get through通过；渡过通过；渡过(难关难关)be buried in/bury oneself in 埋头于，专心于埋头于，专心于词语辨析as a result of与as a resultas a result of“由于；作为的结果”，后接名词、代词或动名词作宾语。as a result“因此，结果”，一般放在句首，后面常加逗号。epidemic to spread worldwi

14、de.Having killed up to 50 million people in 18 months,the Spanish Flu is believed to have been the most severe epidemic in history.More people died of the flu than died in the war.Initially,many people believed that such epidemics no longer posed a threat until very recently when SARS became a cause

15、 for concern.adv.最初，起初；开始最初，起初；开始构成威胁构成威胁不再不再 几个世纪后，第一次世界大战快结束时爆发了1918年大流感，又称西班牙流感。刚刚熬过战争的人们现在不得不埋葬(bury)他们死于疾病的亲人。战争引发的人口流动前所未有，从而导致这一流行病蔓延到全世界。西班牙流感在18个月内造成5 000万人死亡，成为历史上最严重的流行病。死于该病的人比死于战争的人还要多。最初，人们以为这种大规模流行病不会再对人类构成(pose)威胁，直至非典出现，再次让全球陷入担忧。The SARS epidemic began in 2002 with a case of lung d

16、isease in Guangdong Province.It spread to Canada,Vietnam and Singapore and lasted until 2003.SARS was examined by scientists,who were confused by this new disease and wanted to learn more about it and its causes.be confused by对对.困惑困惑蔓延到蔓延到一例一例肺部疾病肺部疾病了解更多关于了解更多关于.Infection rates went up steadily,and

17、 in the course of the outbreak,about 8,000 people were infected over nine months.Since the end of the SARS epidemic,scientists have been doing trials on treatments to prevent any future outbreaks.do trials on做试验做试验感染率感染率go up增长；上升增长；上升在在.的过程中的过程中the outbreak of epidemic/war 流行病流行病/战争战争的爆发的爆发 非典疫情始于2

18、002年广东省的一例肺部(lung)疾病，后蔓延到加拿大、越南和新加坡，并一直持续到2003年。科学家对这种新型疾病感到困惑，对SARS病毒进行检测，以期了解该病与致病原因的更多信息。非典的感染率不断(steadily)上升，在爆发(outbreak)期九个月内感染了约8 000人。非典疫情结束后，科学家们一直在试验(trial)各种治疗手段，以防止未来疫情再爆发。Then,from 2013 to 2016,there was the most widespread outbreak of the Ebola Virus Disease(EVD)in West Africa,which re

19、sulted in a major loss of life in a number of west African countries.11,310 deaths were officially recorded,but the actual number of deaths is 大批人去世大批人去世result in导致导致从从.到到.which引导非限制性定语从句引导非限制性定语从句a number of许多许多probably much higher.The virus was extremely infectious and the survival rate was as low

20、 as 30%in some areas,indicating that very few people got over it.get over 克服克服存活率存活率像像.一样；如同一样；如同 随后，2013年到2016年间，西非爆发了大规模传染病埃博拉出血热(EVD)，夺去了这一地区多个国家的很多人的生命。官方统计的死亡人数为11 310人，而实际(actual)死亡人数可能要更高。该病毒传染性极强，一些地区的存活率低至30%，也就是说很少有人能康复。Despite,or perhaps because of,the epidemics the world has faced in rec

21、ent years,governments worldwide have underlined the fact that they want thorough and systematic medical research on epidemics to get at the causes and come up with cures as soon as possible.that 引导同位语从句引导同位语从句近年来近年来尽管尽管因为因为了解；发现了解；发现提出；想出提出；想出尽早，尽快尽早，尽快Countries will need to work together to do this because teamwork among nations across the globe can save lives.拯救生命拯救生命共同努力共同努力全球全球 尽管(或者是因为)近年来全球爆发了流行病，世界各国政府都已经强调(underline)，要对流行病进行彻底(thorough)和系统(systematic)的医学研究，以便尽快找出原因并找到治疗方法。这需要各个国家的共同努力，因为全球(globe)各国之间的团队合作才能拯救生命。课文结构图示