参考文献：相关文献概览
1. A considerable amount of literature has been published on X. These studies ......
2. There is a large volume of published studies describing the role of ......
3. The first serious discussions and analyses of X emerged during the 1970s with ......
4. The generalisability of much published research on this issue is problematic.
5. What we know about X is largely based upon empirical studies that investigate how ......
6. During the past 30 years much more information has become available on ......
7. In recent years, there has been an increasing amount of literature on .......
8. A large and growing body of literature has investigated ......
参考文献：以往研究或学术活动相关文献
1. Many historians have argued that ...... (eg. Jones, 1987; Johnson, 1990; Smith, 1994)
2. Numerous studies have attempted to explain ..... (for example, Smith , 1996; Kelly, 1998; Johnson, 2002)
3. Recent evidence suggests that ....... (Smith, 1996; Jones 1999; Johnson, 2001)
4. Recently, in vitro studies have shown that T.thermophylus EFTu can ...... (Patel et al., 1997;Jones et al., 1998).
5. Surveys such as that conducted by Smith (1988) have shown that ......
6. Several attempts have been made to ....... (Smith, 1996; Jones 1999; Johnson, 2001)
7. Several studies have revealed that it is not just X that acts on ...... (Smith, 1996; Jones .......
8. Several biographies of Harris have been published. Smith presents an ........ account, whilst Jones .....
9. Several studies investigating X have been carried out on ......
10. Data from several sources have identified the increased morbidity and mortality associated with obesity
11. Previous studies have reported ...... (Smith, 1985; Jones, 1987; Johnson, 1992).
12. Previous research findings into X have been inconsistent and contradictory (Smith, 1996; Jones 1999, ......
13. A number of studies have found that ...... (Smith , 2003; Jones, 2004).
14. Twenty cohort study analyses have examined the relationship between .......
15. At least 152 case-control studies worldwide have examined the relationship between......
16. Other studies have considered the relationship ......
17. The relationship between X and Y has been widely investigated (Smith, 1985; Jones, 1987, .......
18. The causes of X have been widely investigated (Jones, 1987; Johnson, 1990; Smith, 1994).
19. The geology of X has been addressed in several smallscale investigations and .......
20. Xs have been identified as major contributing factors for the decline of many species (1).
21. X has also been shown to reverse the anti-inflammatory effects of glucocorticoids in murine- induced arthritis (11).
22. It has been suggested that levels of X are independent of the size of the Y (Smith et al., 1995) It has conclusively been shown that X and Y increase Z (Smith et al., 1999; Jones, 2001 ......
23. It has been demonstrated that a high intake of X results in damage to ...... (Smith, 1998; ......
文章重点：当前理论存在的问题、局限性
1. One question that needs to be asked, however, is whether ......
2. A serious weakness with this argument, however, is that ......
3. One of the limitations with this explanation is that it does not explain why...4. One criticism of much of the literature on X is that ......
5. The key problem with this explanation is that ......
6. The existing accounts fail to resolve the contradiction between X and Y.
7. However, there is an inconsistency with this argument.
8. Smith's argument relies too heavily on qualitative analysis of ......
9. It seems that Jones' understanding of the X framework is questionable. Smith's interpretation overlooks much of the historical research ......
10. One major criticism of Smith's work is that .....
11. Many writers have challenged Jones' claim on the grounds that .......
12. X's analysis does not take account of ..... nor does he examine ......
文章重点：研究方法存在的问题、局限性
1. Another problem with this approach is that it fails to take X into account.
2. Perhaps the most serious disadvantage of this method is that .....
3. Difficulties arise, however, when an attempt is made to implement the policy.
4. Nevertheless, the strategy has not escaped criticism from governments, agencies and academics.
5. One major drawback of this approach is that ......
6. The main limitation of biosynthetic incorporation, however, is ......
7. However, this method of analysis has a number of limitations.
8. However, approaches of this kind carry with them various well known limitations.
9. All the studies reviewed so far, however, suffer from the fact that .......
10. However, there are limits to how far the idea of/concept of X can be taken.
11. However, such explanations tend to overlook the fact that......
12. However, one of the problems with the instrument the researchers used to measure X was ......
描述实验方法：强调一个特殊的方法
1. Article references were searched further for additional relevant publications. Articles were searched from January 1965 until April 2008.
2. Publications were only included if .......
3. X was prepared according to the procedure used by Patel et al. (1957).
4. The synthesis of X was done according to the procedure of Smith (1973).
5. X was synthesised using the same method that was detailed for Y, using ......
6. This compound was prepared by adapting the procedure used by Zhao et al. (1990).
7. For this study the X was used to explore the subsurface ......
8. An alternative method for making scales homogenous is by using .....
描述实验方法：描述样品的特性
1. The initial sample consisted of 200 students of whom 13 did not complete all of the interviews
2. All studies described as using some sort of X procedure were included in the analysis.
3. A systematic literature review was conducted of studies that .....
4. All of the participants were aged between 18 and 19 at the beginning of the study.....
5. Two groups of subjects were interviewed, namely X and Y. The first group were ......
6. A random sample of patients with ...... was recruited from .......
7. Forty-seven students studying X were recruited for this study.
8. The students were divided into two groups based on their performance on ......
9. The project used a convenience sample of 32 first year modern languages students.
10. Just over half the sample (53%) was female, of whom 69% were ......
11. Participants were recruited from 15 clinics across ......, covering urban and rural areas ......
12. Eligibility criteria required individuals to have received ....
13. Five individuals were excluded form the study on the basis of ....
14. Eligible women who matched the selection criteria were identified by ......
15. Semi structured interviews were conducted with 17 male offenders with a mean age of 38 years
16. A comparison group of 12 male subjects without any history of X was drawn from a pool of .......
描述实验过程：目的不明确
1. In order to identify the T10 and T11 spinous processes, the subjects were asked to ......
2. In order to understand how X regulates Y, a series of transfections was performed.
3. To enable the subjects to see the computer screen clearly, the laptop was configured with ......
4. To see if the two methods gave the same measurement, the data was plotted and ......
5. To control for bias, measurements were carried out by another person.
6. To measure X, a question asking ...... was used.
7. To determine whether ......, KG-1 cells were incubated for ......
8. To establish whether ......,
9. To increase the reliability of measures, each X was tested twice with a 4-min break between .......
10. To compare the scores three weeks after initial screening, a global ANOVA F-test was used The vials were capped with ..... to prevent volatisation.
11. In an attempt to make each interviewee feel as comfortable as possible, the interviewer ......
描述实验过程：其他描绘实验过程的句型
1. For the purpose of height measurement, subjects were asked to stand .....
2. For the purpose of analysis, 2 segments were extracted from each ......
3. For the estimation of protein concentration, 100 μL of protein sample was mixed with ......
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