关于美国二战的英语演讲稿.doc

world war 2brief introduce:as we all know ,world war 2,was a global military conflict ,lasting from 1939 to 1945. today , l d like to give you a brief introduce about this war.world war 2 involved most of the country at that time , including all of the great powers, and it divided into 2 opposing military organization :the axis and the allies.now, let s look at picture , the allies mainly contains : america, the soviet union , britain and china , the axis contains : german , italy , japan and so on .then ,lets know about the leaders of mainly country during the war.1. adolf hitler: the core characters in germany of world war 2.in 1939,he against poland which launched the second world war4. rooseveltalthough he is the disabled person , he is still the greatest leader of usa who sparked the fire of the whole country with one heart new spirit.note1 the versailles treaty was regarded as the fuse of the war. note2: nazi ,this name is full of attractive but in fact ,it is the symbol of evil .reason:the outbreak of war had lots of causes , but as far as im concerned , the most important reasons are that. in a word, due to the seriously economic crisis , the axis went to the way of fascist. they tried their whole country power and resources to develop the arms and to prepare for expansion.in the meantime ,the axis were not satisfied with the versailles treaty and they all wanted to control the whole world. while ,unfortunately ,the allies faced to the ambitions of the axis negatively and they were busy developing the economic . so ,after that ,the world war 2 broke cess:in euro.in september,1939,germany launched a lightening attack on poland which led britain and france declared war on germany 2 days later. after that , germany captured france and some other small western european countries.then ,on 1941.6.22, germany opening of the second front and attack the ussr.1. leningrad defence :in the north, the northern army group surrounded the leningrad ,it was the symbol of the culture in the soviet . despite great suffering, however, the people of leningrad refused to surrender. when food ran out, people died from hunger and disease. finally ,the red army broke the three-year siege of leningrad on january 15, 1944. this war is the bloodiest battles in the history of warfare.2. the battle of moscow :moscow is the capital of the union of soviet socialist republics (ussr) and it is also the largest soviet city. moscow was regarded as the political center ,so stalin ordered that all the red army soldiers should never step back. this battle lasted for about 6 month, and ended with the victory of ussr in 1942.01.07.3. the battle of stalingrad by the summer of 1942. in the south, the southern army group pushed east to stalingrad, a great industrial city, it was the economic centre of the soviet .this war was a major battle of world war ii . during this battle, the soviet given the germany army a heavy blow .afterwards, the german can never leaded off an attack. so its the turning points of the war.in asian.japan attacked to pearl harbor in 1941,12,7.then america joined the war.the battle of songhu in the asian battlefield .china played a very important role .she suffered from the main attack of japan, and she also made great sacrifice to anti fascist.class2the turning points. 7normandy landings : in 1944, the second european front was opened, britain and the us landed on the beaches of normandy. it means germany will trend to failure in near future.finally battles. after the allies occupied berlin, in 1945,5,8. germany surrendered. on august,1945 , the us dropped 2 atom bombs on japan ,finally ,japanese surrendered .the world war 2 came to the end.my thought: in my humble opinion ,despite the non just to be honest ,the germany army was the most powerful forces in that time .but adolf hitler had made 3 unforgivable mistakes which let germany went to fail.first ,he didnt try his best to beat britain , so he forced to fight on two fronts which let germany spent more resources . second ,he didnt overcame the lenin ziegler ,so germany army couldnt success to meet with finland, the country was attacked by the soviet in 1939, and the powerful northern army group couldnt go to south to surround the soviet army .finally ,the most important point is that hitler adopted a policy of genocide .due to that reason , many enemy was forced to do life and death struggle ,though they were reluctant and hate to fight.result:tag:thank you for listening.(stealth material)stealth material introductionchapter1good afternoon everyone! today, i will give you a presentation about the stealth material.chapter2firstly, lets look at a group of pictures. it is a piece of invisibility cloak, which we can wear it from being seen by others. maybe everyone of us all want to have a trying of the amazing thing.chapter3looking at the pictures, how wonderful they are! this is the stealth material that i want to introduce to you today.)chapter6next, this is the classification of stealth material. according to the application of stealth material can be divided into stealth coating material() and stealth structure materials() alsoit can be classified as laser stealthsoundradarinfraredvisible lightaccording to the spectrum of stealth materialchapter7today, we focus on several principles of stealth material. first of all, we learn about radar absorbing materials.the working principle of the radar can classified as reflection, transmission and absorption .refle- cting is that radar using the reflection wave to detect the object ().but, how to make waves do not return back? -absorbed the incident wave ().chapter8then,its stealth features require him able to absorb or through the radar wave, decrease as far as possible to detect the reflected wave. the radar stealth material is given priority to with absorbing material.according to the application of stealth material can be divided into stealth coating material() and stealth structure materials()chapter9lets introduce the coating absorbing materialsfirstly, type coating absorbing material is on the target surface coated with a layer orchapter10another type of stealth material is structural absorbing materials() .firstly, a kind of multi-functionalf-117chapter11infrared stealth materials(),the working principle of infrared stealth materials is using the target from the infrared to find, identify and track the target.usually background temperature is low, less radiation energy.chapter12now, we learn about laser stealth material. in infrared wave, especially in the near infrared wave has strong absorption ability or shielding effect, make the difference of target and environment. by reducing the targets emissivity and temperature to achieve infrared stealth. ,the working principle of the radar can classified aslaser stealth process is similar with the process of radar stealth, main is to reduce reflection coefficient on the surface of the target, reduce the echo power of the laser detector.in addition, also can be used on engineering transmission material, light material, photochromic material, variable polarization, etc.chapter14the application of stealth materials-military scienceduring world war ii: mosquito bomber (first)in the late 1950 s, the representative is americas u - 2 reconnaissance aircraftin the 1960 s, with the lockheed design of sr - 71 blackbird is most typical.2050 u -22060sr - 7110f -117a b- 2a chapter18the application of stealth materials -for civil use () abstractkey words: american, britain, rise, the industrial revolution,world war ii,hegemonism1. the main topic of the thesisbefore the world war ii ,world hegemony has belonged to the britain ,but after the world war ii, the british world domination was replaced by the united states, this is why?2. the reasons of the britains decline , the rise of american after the world war iifinally, because of the domestic turmoil, many scientists in britain leave their home town to some place and the science and technology developed slowly and straightly down . by contrast, the united states support a free and open research environment, attract creative talent around the world, promote the economic development to upgrade, domestic relatively stable economic development the united states not only military but also the developmen