新视野大学英语（第三版）第二册课后翻译答案及原文Unit 1原文： English is known as a world language, regularly used by many nations whose English is not their firstlanguage. Like other languages, English has changed greatly. The history of the English language can be dividedinto three main periods: Old English, Middle English and Modern English. The English language started with theinvasion of Britain by three Germanic tribes during the 5th century AD, and they contributed greatly to theformation of the English
