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oustic problem of longs paces(长空间的声学问题)，例如，公路与铁路隧道上的噪声污染就是一个严重的问题。地铁站的广播系统语言清晰度差，造成在紧急状态下信息误解，因此，这个问题值得研究解决。
通过分析这些例子，还可以发现如下特点。
首先，关键词往往出现在第一句话，回答What is the research area? 这个问题，迅速将主题告诉读者，避免转弯抹角，影响信息传递。然后简单介绍该研究领域的意义。
第二，引言开头句子的谓语动词或者是一般现在时态，或者是现在完成时态。这是因为这些动词所描述的是某研究领域的现状，而不是过去的情况。
引言的开头常用句型有：
句型1：研究主题+谓语动词be… ．例
a．Fuel cell(燃料电池)is a technology for the clean and efficient conversion from chemical energy in fossil fuels to electricity．
句型2: 研究主题+ has become …
a. Semiconductor based industry (基于半导体的工业)has be come the largest industry for the USA and it has influenced every other industry and every aspect of human life.
b. The battery technology has become increasingly popular in automotive industry.
c. Forest decline has become a favorite topic for environmental studies.
句型3：研究主题 + be 过去分词（被动语态）
a. Synthetic polymers (聚合物) are widely used in contact with biological systems in applications such as medicine, biotechnology, food processing and natural water environment.
b. Air pollution has been extensively studied in recent years.
c. The causes of glaucoma have been widely investigated recently.
d. The importance of safe driving is now well established.
句型4: Recently, there has been growing interest in / concern about + 研究主题
 a. Recently, there has been growing concern about waste-water biosolid, the residual organic matter produced during waste water treatment.
b. In the 1990s there has been growing interest in the development of electric vehicles in response to the public demand for cleaner air.
句型5: Recently there have / has been extensive / increasing /numerous publications / literature / reporting on + 研究领域
a. There have been numerous publications over the last ten years on the need for nursing education to keep pace with the increase in knowledge of biological science.
b. There has been increasing reporting about forest decline in North America.
句型6: Researchers have become increasingly interested in +研究领域 或:Researchers have recently focused their attention on +研究领域；Researchers are recently paying more attention to + 研究领域
a. Researchers have become more interested in environmental indicators.
b. Researchers are paying more attention to high pressure injection (高压喷射).
3 如何写文献综述
文献综述是学术论文的重要组成部分，是作者对他人在某研究领域所做的工作和研究成果的总结与评述，包括他人有代表性的观点或理论、发明发现、解决问题的方法等。在援引他人的研究成果时，必须标注出处，即这一研究成果由何人在何时何地公开发表。
3.1文献出处的标注
引用文献时，不同的学科或领域可能采用各自约定俗成的体系或格式。在写论文时，应该了解自己学科采用的固定本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。