英语说明性演讲稿

什么主题？ 什么字数？什么时候要？ PENICILLIN-Wonder DrugMedicines have changed people's lives.If you open up any medicine cupboard in the world,there is a high probability that you will find penicillin,which has saved millions of people's lives since they were invented.Penicillin has helped increase the standard of people's health.This bacteria-killing medicine is considered by many to be one of the most important medicines in contemporary society.It was discovered by a Scottish scientist named Alexander Fleming in 1928.He noted that mould had grown on a special transparent jelly that had bacteria on it.He saw that the cells of the bacteria were clear,which meant that they were dead and that the mould had killed them.Fleming tried this mould out on another bacterium and found that it killed the bacterium too.He immediately thought that this application might help in treating wounds and illnesses caused by bacteria.He named the chemical found in the mould 'penicillin' and tried to make it pure to be a medicine,but was unable to do that.Fleming did not give up.However,it was not until World War II that two other scientists,Howard Florey(Australian) and Ernst Chain (German-born English),managed to use new chemical techniques to purify it.They were able to produce it in large quantities.The new drug was needed immediately because of the war,so mass production started quickly.Due to the widespread use of penicillin,many lives were saved during World War II.It was a dream come true.If penicillin had not been available,many people would have died from bacterial illnesses or even minor wounds.Penicillin is also used to treat other illnesses including pneumonia,an illness that affects the lungs.So,althoughFleming discovered penicillin,it was over a decade before someone else turned penicillin into the great drug of the 20th century.Penicillin is still widely used today, though many types of bacteria are now resistant.In 1945,all the three scientists,Fleming,Florey and Chain,shared the Nobel Prize in Physiology or Medicine for their work,and penicillin rapidly became the powerful 'wonder drug' which saved millions of lives.说明青霉素的。

As everyone knows,English is very important today.It has been used everywhere in the world.It has become the most common language on Internet and for international trade. If we can speak English well,we will have more chance to succeed.Because more and more people have taken notice of it,the number of the people who go to learn English has increased at a high speed. But for myself,I learn English not only because of its importance and its usefulness,but also because of my love for it.When I learn English, I can feel a different way of thinking which gives me more room to touch the world.When I read English novels,I can feel the pleasure from the book which is different from reading the translation.When I speak English, I can feel the confident from my words.When I write English,I can see the beauty which is not the same as our Chinese... I love English,it gives me a colorful dream.I hope I can travel around the world one day. With my good English, I can make friends with many people from different contries.I can see many places of great intrests.I dream that I can go to London,because it is the birth place of English. I also want to use my good English to introduce our great places to the English spoken people,I hope that they can love our country like us. I know, Rome was not built in a day. I believe that after continuous hard study, one day I can speak English very well. If you want to be loved, you should learn to love and be lovable. So I believe as I love English everyday , it will love me too. I am sure that I will realize my dream one day! Thank you! 正如每个人所知，英语在今天十分重要。它已经被应用到世界的各个角落。它已经成为商业上最为通用的一门语言并广泛的用于国际贸易。如果我们能说好英语，我们就有更多的机会成功。因为越来越多的人注意到这一点，学英语的人数正在已很高的速度增长。 但是对我而言，我学英语不仅仅因为它的重要性以及它的实用性，更是因为我喜爱英语。当我学英语时，我可以体会到一种不同的思维方式，它可以给我更多接触世界的空间。当我读英语小说时，我能感受到不同于阅读翻译文的快乐。当我说英语时，我可以感到自信。当我写英语时，我能够感到不同于汉语的那种美…… 我爱英语，它给了我一个色彩斑斓的梦。我希望有朝一日我可以畅游世界，用我流利的英语，我可以和世界各地的人交友。我能看到许多的名胜。我希望我能够到伦敦去，因为那里是英语的故乡。 我也希望用我流利的英语来将我们的名胜介绍给说英语的朋友，我希望他们可以像我们一样的爱我们的国家。 我知道，罗马不是一天筑成的。（成功需要日积月累。）我相信在持续不断的努力学习下，总有一天我可以拥有一口流利的英语。 如果你想被爱，你就应该学着去爱他人。所以我相信我对英语的爱定将换来它对我的爱。 我相信总有一天我会实现我的梦！ 谢谢！

(*^__^*) 嘻嘻……帮你在网上找的，希望你好运！still remember the Tatinic,though it's a big ship but it still sunk,so ,in my opinion ,the best ship is the friendship. Everyone needs friends baceuse there are a lot of things that you can't deal with ypourself,and the friends judt make up for it. friendship just likes the sun ,it can make you fell warm though in the cold winter,friendship just likes the water in the desert ,it can make you fell that in the world ,there still has hope .in a word ,the friendship is the same meaning as the greatness ,selfness and devotion. To make friends ,adding a friend equals addng a way ,open your heart ,devote yoursef,let friendship make your world colourful,