写好一篇留学论文的引言是确保文章成功的关键之一。在引言中，您需要引导读者进入您的研究领域，并明确问题的重要性。本文Dr.D将展示八个高分留学论文引言的例句，帮助大家构建引人入胜的开篇。
1、Establishing the importance of the topic for the discipline
X is a dominant feature of …
X is a fundamental property of …
Xs are the most widely investigated …
Studies on X represent a growing field.
X is an increasingly important area in...
The concepts of X and Y are central to …
X is at the heart of our understanding of …
X is attracting considerable critical attention.
Central to the theory of X is the Y hypothesis.
X has been shown to occur in many different …
Investigating X is a continuing concern within …
2、Establishing the importance of the topic for the discipline: time frame given
Recent trends in X have led to a proliferation of studies that ...
Recent years have witnessed a growing academic interest in …
The nature of X has been the subject of several recent papers.
Over the past century, there has been a dramatic increase in …
X proved an important literary genre in the early Y community.
X has received considerable scholarly attention in recent years …
In recent years, researchers have shown an increased interest in ...
Recently, considerable literature has grown up around the theme of …
Recent developments in the field of X have led to a renewed interest in …
The past thirty years have seen increasingly rapid advances in the field of …
In the last few decades, there has been a surge of interest in the effects of …
For more than a century, scientists have been interested in the existence of …
The most significant recent developments in this direction have been those of …
3、Establishing the importance of the topic for the world or society
Xs are the most potent anti-inflammatory agents known.
There is evidence that X plays a crucial role in regulating …
In the history of X, Y has been thought of as a key factor in …
X is a common condition which has considerable impact on …
In the new global economy, X has become a central issue for ...
Determining the impacts of X on Y is important for the future of …
Evidence suggests that X is among the most important factors for …
X is important for a wide range of scientific and industrial processes.
X is an important component in the X system, and plays a key role in ...
There is a growing body of literature that recognises the importance of …
Xs were the most serious and widespread popular disturbances to occur in …
4、Establishing the importance of the topic as a problem to be addressed
X is associated with increased risk of …
X impacts negatively upon a range of …
X is a common disorder characterised by …
It is now well established that X can impair …
X has led to the decline in the population of …
X is a growing public health concern worldwide.
The main challenge faced by many researchers is the …
X is one of the most frequently stated problems with …
Lack of X has existed as a health problem for many years.
X is a major environmental problem, and the main cause of …
Xs are one of the most rapidly declining groups of insects in ...
Exposure to X has been shown to be related to adverse effects in …
There is increasing concern that some Xs are being disadvantaged …
There is an urgent need to address the safety problems caused by …
The prevalence of X is increasing at an alarming rate in all age groups.
5、Referring to previous work to establish what is already known
Recent work by historians has established that …
Previous research comparing X and Y has found …
The existing body of research on X suggests that …
There is a growing body of literature that recognises …
Several theories on the origin of X have been proposed.
Existing research recognises the critical role played by …
It is now well established from a variety of studies, that …
A growing body of published work provides evidence of …
Recently investigators have examined the effects of X on Y.
Surveys such as that conducted by Smith (1988) have shown that …
Evidence from a number of experimental studies has established that …
Factors found to be influencing X have been explored in several studies.
A number of cross-sectional studies suggest an association between X and Y…
Studies over the past two decades have provided important information on …
A considerable amount of literature has been published on X. These studies …
In the past two decades, a number of researchers have sought to determine …
In previous studies of X, different variables have been found to be related to ...
6、Identifying a controversy within the field of study
To date there has been little agreement on what ...
The issue has grown in importance in light of recent ...
There has been disagreement on the criteria for defining X.
One observer has already drawn attention to the paradox in ...
Questions have been raised about the use of animal subjects in ...
In the literature on X, the importance of Y has been hotly debated ...
In many Xs, a debate is taking place between Ys and Zs concerning ...
Debate continues about the best strategies for the management of ...
This concept has recently been challenged by X studies demonstrating ...
There has been much disagreement between historians on the subject of …
The debate about X has gained fresh prominence with many arguing that ...
Scholars have long debated the impact of X on the creation and diffusion of …
More recently, literature has emerged that offers contradictory findings about ...
One of the most significant current discussions in legal and moral philosophy is ...
The relationship between X and Y has attracted conflicting interpretations from …
One major theoretical issue that has dominated the field for many years concerns ...
7、Noting the lack of or paucity of previous research
There has been little quantitative analysis of ...
Data about the efficacy and safety of X are limited.
Up to now, far too little attention has been paid to ...
A search of the literature revealed few studies which …
The impact of X on Y is understudied, particularly for …
So far, however, there has been little discussion about ...
In addition, no research has been found that surveyed ...
Surprisingly, the effects of X have not been closely examined.
Surprisingly, X is seldom studied, and it is unclear to what extent …
In contrast to X, there is much less information about effects of …
X has hitherto received scant attention by scholars of the Y period.
A systematic understanding of how X contributes to Y is still lacking.
While X is a growing field (Smith, 2015), publications on Y remain few.
Relatively little research has been carried out on X, and even less on Y.
Despite the importance of X, there remains a paucity of evidence on …
There have been no controlled studies which compare differences in ...
The issue of X has attracted very little attention from the scholarly community.
To date, the problem of X has received scant attention in the research literature
8、Highlighting inadequacies or weaknesses of previous studies (also refer to Being Critical)
Most studies in the field of X have only focused on ...
Previous published studies are limited to local surveys.
Half of the studies evaluated failed to specify whether ...
The research to date has tended to focus on X rather than Y.
Previously published studies on the effect of X are not consistent.
Smith’s analysis does not take account of ..., nor does she examine ...
The existing accounts fail to resolve the contradiction between X and Y.
Most studies of X have only been carried out in a small number of areas.
However, much of the research up to now has been descriptive in nature ...
The generalisability of much published research on this issue is problematic.
Research on the subject has been mostly restricted to limited comparisons of ...
However, few writers have been able to draw on any systematic research into ...
Short-term studies such as these do not necessarily show subtle changes over time …
Although extensive research has been carried out on X, no single study exists which ...
However, these results were based upon data from over 30 years ago and it is unclear if ...
Recent attempts to understand X (e.g. Smith 1989; Jones 1992) pay too little attention to …
The experimental data are rather controversial, and there is no general agreement about ...
However, all the previous X research was cross-sectional in design. Therefore, it is unclear if …
Although there are many reports in the literature on the outcome of X, most are restricted to ...
