新视野大学英语第三版 book 2 unit 1 翻译英译中：English is known as a world language, regularly used by many nations whose English is not their first language. Like other languages, English has changed greatly. The history of the English language can be divided into three main periods : Old English, Middle English and Modern English. The English language started with the invasion of Britain by three Germanic tribes during the 5th century AD, and they contributed greatly to the formation of the English langua
