最新英语sci写作的万能句型.docx

1、最新英语sci写作的万能句型文献简介1. Recently investigators have examined the effects of X on Y.2. In the past two decades a number of researchers have sought to determine .3. Previous studies have reported .4. A considerable amount of literature has been published on X. These studies .5. Smith (1984: 217) shows ho

2、w, in the past, research into X was mainly concerned with .6. Surveys such as that conducted by Smith (1988) showed that .7. The first serious discussions and analyses of X emerged during the 1970s with .8. Recent evidence suggests that .9. Several attemps have been made to .10. A number of research

3、ers have reported .11. Xs were reported in the first models of Y (e.g., Smith, 1977; Smith, & Patel, 1977).12. What we know about X is largely based upon empirical studies that investigate how . Studies of X show the importance of .强调研究领域存在的问题1. However, these rapid changes are having a serious effe

4、ct .2. However, a major problem with this kind of application is .3. Lack of X has existed as a health problem for many years.Despite its safety and efficacy, X suffers from several major drawbacks:4. However, research has consistently shown that first year students have not attained an adequate und

5、erstanding of .5. There is increasing concern that some Xs are being disadvantaged .6. Despite its long clinical success, X has a number of problems in use.7. Questions have been raised about the safety of prolonged use of .强调研究领域存在的争议1. To date there has been little agreement on what .2. More recen

6、tly, literature has emerged that offers contradictory findings about .3. One observer has already drawn attention to the paradox in .4. In many Xs a debate is taking place between Ys and Zs concerning .5. The controversy about scientific evidence for X has raged unabated for over a century.6. Debate

7、 continues about the best strategies for the management of .7. This concept has recently been challenged by . studies demonstrating .强调研究领域的知识差距1. So far, however, there has been little discussion about .2. Little is known about X and it is not clear what factors .3. However, far too little attentio

8、n has been paid to .4. In addition, no research has been found that surveyed .5. So far this method has only been applied to .6. This indicates a need to understand the various perceptions of poverty that exist among .7.However, the evidence for this relationship is inconclusive .8.What is not yet c

9、lear is the impact of X on .9.The neurobiological basis of this X is poorly understood.10. However, much uncertainty still exists about the relation between .11. Until recently, there has been no reliable evidence that .12. However, there have been no controlled studies which compare differences in

10、.13. Several studies have produced estimates of X (Smith, 2002; Jones, 2003), but there is still insufficient data for .14. No previous study has investigated X15. Although extensive research has been carried out on ., no single study exists which . .强调前人研究的不足之处1. Most studies in the field of X have

11、 only focussed on .2. Most studies in X have only been carried out in a small number of areas.3. The generalisability of much published research on this issue is problematic.4. The experimental data are rather controversial, and there is no general agreement about .5. Such expositions are unsatisfac

12、tory because they .6. However, few writers have been able to draw on any structured research into the opinions and attitudes of .7. The research to date has tended to focus on X rather than Y.8. The existing accounts fail to resolve the contradiction between X and Y.9. Researchers have not treated X

13、 in much detail.10. Previous studies of X have not dealt with .11. Half of the studies evaluated failed to specify whether .12. However, much of the research up to now has been descriptive in nature .13. Although extensive research has been carried out on X, no single study exists which adequately c

14、overs .14. However, these results were based upon data from over 30 years ago and it is unclear if these differences still persist.15. Xs analysis does not take account of . nor does he examine .重申研究目的1. Part of the aim of this project is to develop software that is compatible with X operating syste

15、m.2. The main purpose of this study is to develop an understanding of .3. There are two primary aims of this study: 1. To investigate . 2. To ascertain .4. The aim of this research project has therefore been to try and establish what .5. The aim of this study is to investigate the differences between .6. The main aim of this investigation is to assess the doses and risks associated with .