新视野大学英语第三册第六单元课文讲解.ppt
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1、Unit 6How to prepare for earthquakes Ideally,people would like to know when an earthquake is going to happen and how bad it will be.In both Japan and China,people have long believed that earthquakes can be forecast.In Japan,scientists have wired the Earth and sea to detect movements.The Chinese have
2、 traditionally watched animals and plants for warning signs of earthquakes.For example,the Chinese have noted that before an earthquake,hens behavior changesthey refuse to enter their cages at night.They have also noticed that snakes come out of the ground to freeze to death and that dogs bark a lot
3、,evenParagraph 1normally quiet dogs.Before the Hanshin earthquake in Japan,there were reports of large schools of fish swimming near the surface of the water.Certain birds,like pigeons,also seemed to be especially noisy and were reported to be flying in unusual patterns before the earthquake.Perhaps
4、 most interesting,and most easily measured,is a chemical change in ground water before a quake.Experimental data seem to indicate that the amount of radon(Rn)in the water under the surface of the Earth waxes before an earthquake.译文句型Paragraph 2 People would also like to be able to prevent the great
5、destruction of property caused by earthquakes.After all,most of the people who die in earthquakes are killed by falling buildings.Therefore,building structures that can withstand the power of earthquakes is a major concern.Steel seems to be the best material,but not if it is welded to form a rigid s
6、tructure.Many new structures are built with a new type of steel joint,an I-joint,which appears to be the most d u r a b l e t y p e o f j o i n t.译文句型 These joints of steel can move without breaking.Also,to prevent property damage,architects now design buildings so that the buildings columns and hor
7、izontal beams are of equal strength,and vertical support columns are inserted deep into solid soil.In addition,many new houses have relatively light roofs and strong walls.Concrete pillars for highway bridges that previously only had steel rods inside are now enclosed in steel.译文Paragraph 3 Besides
8、working to improve building structures,people in areas where earthquakes are common need to prepare for the possibility of a great earthquake.They should regularly check and reinforce their homes,place heavy objects in low positions,attach cupboards and cabinets to walls,and fasten doors so that the
9、y will not open accidentally during an e a r t h q u a k e .译文句型 In addition to preparing their houses,people in these regions need to prepare themselves.They should have supplies of water and food at home and at work.It is best to store several gallons of water per person.It is also important to ha
10、ve something that can clean water and kill bacteria,so water from other sources can be made safe to drink.Store one weeks food for each person.Earth-quake survival supplies include a radio receiver,a torch,extra batteries,first aid supplies,a spade,a tent,some rope,and warm clothing.Experts also sug
11、gest the following:译文Paragraph 4 Keep a fire extinguisher handy.You should have one at home,at work,and in your car(if you have one).The fire extinguisher should be able to put out any type of fire.Have the proper tools to turn off gas and water lines if necessary.Arrange an auxiliary cooking and he
12、ating source that can be used outside.One alternative is a portable camp stove with small cans of gas.Keep a pair of heavy,comfortable shoes or boots in your home,at work,and in your vehicle.If there is an earthquake,there will be lots of fragments of broken glass.Light shoes will not protect your f
13、eet a s w e l l a s h e a v y s h o e s w i l l.译文Paragraph 5 Every family needs to have earthquake emergency plans.How will family members leave the area during the chaos following an earthquake?Everyone should agree on a meeting point outside of the areaperhaps in a town several miles away.Also im
14、portant is an arrangement for family members to communicate if there is an earthquake.If an earthquake happens in a large city,many of the telephone lines within the city are likely to be down.译文Paragraph 6 The few remaining working lines will be busy with the calls that naturally occur after a disa
15、ster and it will be difficult to call from one part of the city to another.It might,however,be possible to call outside the city.A sensible arrangement is to have all of the members of the family call to check in with a friend or relative who lives more than a hundred miles away.译文 Although scientis
16、ts still cannot predict earthquakes,they are learning a great deal about how the large plates in the Earths crust move,the stresses between plates,how earthquakes work,and the general probability that a given place will have an earthquake.Someday soon it may actually become possible to predict earth
17、quakes with accuracy.However,even if prediction becomes possible,people who live in areas where earthquakes are a common occurrence will still have to do their best to prevent disasters by building structures that are resistant to ground movement and by being personally prepared.译文Paragraph 7难句解析 Th
18、ese precautions can make a great difference in saving lives and preventing the loss of homes.Education concerning how to survive an earthquake should be a major emphasis for all government programs and earthquake-related research projects.译文第一段 从理想上说,人们希望知道地震什么时候发生,破坏程度会如何。在日本和中国,人们长期以来一直相信地震是可以预测的。
19、在日本,科学家在陆地上和海洋中铺设电线,以监测它们的运动。而中国人的传统做法是观察动植物以获取地震的警示信号。例如,中国人注意到,地震之前母鸡的行为会有所异常:它们夜晚不肯进笼。他们还注意到,蛇会爬出地穴而冻死,狗会狂吠不已,甚至那些平常很安静的狗也会叫个不停。日本的阪神地震发生之前,有报告说大批鱼群游到了水面。有些鸟,如鸽子,也显得特别聒噪,据说地震前它们飞行的方式也与往常不同。也许最有趣、也最容易测量的,是地震前地下水发生的化学变化。实验数据似乎表明,地震前地下水中氡的含量会增高。返回第二段 人们还希望能够预防地震会造成的重大财产损失。要知道,人们还希望能够预防地震会造成的重大财产损失。要
20、知道,多数在地震中丧生的人都是被倒塌的建筑物砸死的。所以,多数在地震中丧生的人都是被倒塌的建筑物砸死的。所以,具有抗震能力的房屋结构是关注的重点。钢似乎是最佳的建具有抗震能力的房屋结构是关注的重点。钢似乎是最佳的建材,但一旦被焊接成僵硬的结构就不行了。许多新式结构都材,但一旦被焊接成僵硬的结构就不行了。许多新式结构都采用了一种新型的钢接合方法,即采用了一种新型的钢接合方法,即I形接合,它看来是最耐形接合,它看来是最耐用的一种接合。这种钢接合在移动时不会断裂。同样,为了用的一种接合。这种钢接合在移动时不会断裂。同样,为了预防财产损失,建筑师如今设计楼房时会使房屋的支柱和横预防财产损失,建筑师如今
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