Thesis is a Chinese word, and its pinyin is lùn wén, which is a common word in classical literature and refers to conversation or exchange of ideas. Nowadays, papers are often used to refer to articles that conduct research in various academic fields and describe academic research results, which are referred to as papers for short. It is not only a means to discuss problems in academic research, but also a tool to describe academic research results in academic exchanges.

Including academic papers, graduation papers, dissertations, scientific papers, achievement papers and so on. Keywords are selected from the title, abstract and text of the paper, which are words with substantial meaning to express the central content of the paper. Keywords are words used by computer systems to index the content characteristics of papers, which are convenient for information systems to collect and provide readers with retrieval.

Generally, 3-8 words are selected as keywords for each paper, and a new line is set at the bottom left of the "abstract". Phrases are the main forms of English titles, especially noun phrases, that is, titles are basically composed of one or several nouns plus their prepositions and/or postattributes; The title of phrase type should determine the head word and then modify it before and after.

The order of each word is very important, and improper word order will lead to inaccurate expression. Generally don't use declarative sentences, because the title mainly plays a marking role, and declarative sentences are easy to make the title have judgmental semantics, which is not refined and eye-catching. In a few cases (critical, comprehensive and refuting), the question can be used as the title, because the question has an exploratory tone and is easy to arouse the reader's interest.