英语学术短语（一） | 论文的文献综述(Literature Review)部分

The literature review shows that __ 
Previous research showed __ 
Seminal contributions have been made by __ 
A series of recent studies has indicated that __ 
Several theories have been proposed to __, some focusing on __, others on __ 
There has been numerous studies to investigate __ 
This has been used in several studies to assess __ 
Previous studies have shown __ 
Several studies suggest that __ 
This has also been explored in prior studies by __ 
Prior research suggests that __ 
Previous studies have emphasized __ 
The majority of prior research has applied __ 
Most early studies as well as current work focus on __ 
For instance, the following studies were conducted on __ 
Studies of __are well documented, it is also well acknowledged that __ 
A number of authors have recognized __ 
Some authors have also suggested that  __ 
Some authors have driven the further development of __ 
This has been discussed by a great number of authors in literature. 
For example, research has provided evidence for __ 
The authors bring some information about the background of the problem, __ 
As has been previously reported in the literature, __ 
A large number of existing studies in the broader literature have examined __ 
The literature review shows that __ 
There exists a considerable body of literature on  __ 
In short, the literature pertaining to __ strongly suggests that __ 
Over time, an extensive literature has developed on __ 
This section presents a review of recent literature on __ 
This paper begins with a short review of the literature regarding the __ 
Several methods are reported in the literature to address this issue. 
There is a wide choice of __ available in the literature. 
This section reviews the literature related to __ 
It was reported in literature that __ 
A recent study by __ concluded that __ 
In the light of reported __ it is conceivable that __ 
The method introduced by __ has the advantage that __ 
One method employed by __ is __ 
A more comprehensive description can be found in __ 
For example, recent research suggests that __ 
This was successfully established as described by __ 
The author employed a __ methodology which prescribes the use of __ 

A number of questions regarding __ remain to be addressed. 
A closer look to the literature on __, however, reveals a number of gaps and shortcomings. 
This question has previously never been addressed because__ 
Most studies have relied on __ 
Previous studies by __ cannot be considered as conclusive because __ 
Previous studies have almost exclusively focused on __ 
This has been previously assessed only to a very limited extent because __ 
In the present studies __ were constrained to __ 
In previous studies were limited to __ 
Although results appear consistent with prior research, they appear inconsistent with __ 
These are previously unstudied because __ 
As far as we know, no previous research has investigated __ 
Moreover, although research has illuminated __ no study to date has examined __ 
Despite decades of research, this continues to be debated among __ 
This section points out some of the problems encountered in the extant research. 
Although there are many studies, the research in __ remains limited. 
However, the existing research has many problems in representing __ 
The literature on __ is less consistent 
Historically, there has been a great deal of confusion in the literature regarding __ 
This approach remains briefly addressed in the literature. 
These are rarely analyzed in the literature as __ 
There are key questions and notions that are still not discussed in the literature __ 
This is not clearly presented in the literature because __ 
This paper addresses the need for __, so far lacking in the scientific literature. 
To fill this literature gap, this paper identifies __ 
Only a few works in literature demonstrate __ 
Although studies have been conducted by many authors, this problem is still insufficiently explored. 
To our knowledge, no prior studies have examined __ 
However, the existing research has many problems in __ 
Therefore, important issue in the literature is __ 
However, we argue that previous literature suffers from certain weaknesses: __ 
Previous research can only be considered a first step towards a more profound understanding of __ 
The previous studies reveal that __ are usually the most problematic to __

More specific research questions will be introduced and investigated in __ 
A further question is whether __ 
Finally, another promising line of research would be __ 
The study addresses several further questions on __ 
Some of the interesting questions in this context are __ 
In order to address the questions outlined above, we report here __ 
These questions are of central interest as much recent research in __ 
Furthermore, __ is arguably an important question to be addressed. 
The question now is how __ can be used to explain __ 
Study addresses the research question __ 
In order to properly address this question, we __ 
An important question associated with __ is __ 
A critical open question is whether __ 
A still unsolved question is whether __ 
This remains an open question as __ 
This question has previously never been addressed because __ 
This study offers a test of __ research question 
Study addresses the research question __ 
Even in general __ research strategies is needed to explain __ 
The researcher should be interested here in __ 
Many questions remain unanswered __ 
There are some potentially open questions about the validity of __ 
The question that then naturally arises is __ 
The question then becomes how best to define__ 
This was an important question to study as __ 

A more systematic and theoretical analysis is required for __ 
As the authors note earlier, more work is necessary to__ 
Additional studies to understand more completely the key tenets of __ are required. 
The unexpected findings signal the need for additional studies to understand more about __