论文查重-英语文摘中语态与时态的运用
大多数期刊要求英文摘要字数不超过250字，内容应与中文摘要相符。在医学论文中，为了体现叙述的客观事实，通常较少使用第一人称和主动语态，较多使用第三人称和被动语态。使用时间需要与事物发生的时间相一致，叙述基本规律可用现在时，叙述研究对象、方法和结果可用过去时。举一个例子。
Objective:The purpose of this study was to determine whether an in hospital transportable CT scanner can provide diagnostic brain images and to compare the quality of these images with those from a convertional fixed? platform CT scanner.
Subjects and Methods:Twenty seven patients with known or suspected intracranial pathology underwent imaging on a transportable scanner and a fixed? platform scanner within 1hr of each other.Images from each CT examination were evaluated independently by two neuroradiologists who were unaware of patient history.Conspicuousness of intracranial pathology and normal anatomy were rated on a 5? point scale (1 point ‘optimal;5 points’poor or not visualized).Statistical comparisons were made using nonparametric tests.
Results:Seven CT scans were interpreted as showing normal findings and 20 scans revealed intracranial pathology on both CT scanners.Image quality was higher on the fixed scanner(average rating’2.42 points’SE=0.12)than on the transportable scanner(average rating’3.10 points’SE=0.12(p=0.001).Depiction of the cerebellum’midbrain’and supratentorial gray? white matter was better on the fixed scanner(p＜0.05＝.However’we found no significant differences in detection of intracranial pathology between scanners.Both radiologists found images from both scanners to bediagnostic in all 27 patients.
Conclusion:Images of the brain on the transportable CT scanner were less clear than those on a fixed scanner.However’images from the transportable CT scanner were diagnostic in 27 consecutivepatients.The implications of this finding are important for the provision of CT services for critically ill patients who cannot be transported to the radiology department.
以上为 AJR (美国放射学杂志)中一篇完整的英文摘要，主要介绍以下几个方面的特点：①文字简洁、准确；②时态为过去式；③不用第一人称，多用被动语态；④注重方法和结果中的统计方法和数据。对于以英语为母语的非英语作者而言，撰写英文摘要的质量直接关系到作者的英文水平，在这方面，只有多读英文文献，才能达到撰写高质量英文摘要的目的。
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