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d so on. The famous Chinese ones are Sohu, Sina, Neteasy and so on.
2.1.1.3. Meta Search Engines
A meta search engine is a network of many search engines. If the user enter a term in one search engine, other search engines start to work at the same type. This type of search engine enables the user to get search results from different search engines, thus improving efficiency. Famous meta search engines are Infospace, Dogpile, Vivisimo and so on .A popular Chinese meta search engine is Souxing. In terms of search results listing,some list results by source engine directly, eg, Dogpile. However, some list results following their own rules, for example,Vivisimo.
2.1.2. Search Engines in Use
Famous search engines include Altavista, Excite, Hotbot, Infoseek, Lycos, Google, Baidu and so on, However, we will only introduce Yahoo.
Yahoo (https://www.yahoo.com) is the most famous information search tool over the world. It is free, quick-linked, high-quality and with 本论文由英语论文网 www.51lunwen.org整理提供big data capacity. Its home page is terse, but its function is powerful. It enables us to search all the websites, news and even personal information of on the Internet. There is a Chinese website: https://yahoo.com.cn). Ways of Search include classified search and keywords search.
2.1.2.1. Classified Search
All the information is divided into 12 categories, including arts, business and economy, computer and Internet education, entertainment, Government, medicare, news library, administrative area, nature, science, social science and religions. Every category has its subcategories, which can be view by clicking the topics and subtopics. This kind of search begins with the root link, then goes deeper, leading to the webpage, news, FTP Websites and other web sources which we need.
2.1.2.2. Keywords Search
On the home page or any interface of Yahoo there is a textbox. If you enter the keywords and then click the search button on the right, the user will get a list results which match the keywords.

2.2. Corpora
2.2.1. Introduction
A corpus is a collection of written texts, especially the entire works of a particular author or a body of writing on a particular subject(New Oxford Dictionary 1999).The Darwinian corpus, for example, is a collection of written or spoken material in machine- readable form, assembled for the purpose of studying linguistic structures, frequencies, etc. Since the 1980s, corpora are increasingly being used as a resource in translation for corpora are having a growing impact on translation. There are two supports for corpus for corpus-based translation studies—corpus linguistics and descriptive corpus-based translation studies(Zanettin, Bernardini and Stewart, 2007). Descriptive corpus-based translation studies have led to a better understanding of translation phenomena, and helped raise awareness of what is involved in translation. These insights can benefit not only literary translators, but also scholars in related fields(Zanettin, bernardini and Stewart, 2007). Corpora offer a wide variety of uses for translators. However, the most important function is that corpora enable the user to check his translation against texts in the databases. Thus, corpora can be powerful translation tools. In the formulation phase of a translation, the source texts and translations of parallel corpora play an important role, too. The different types of corpora are as follows:
Medium of original represen