在SCI期刊上發表論文的時候，英文技能是必不可少的，英文摘要也是相當重要的一部分，本文著重介紹了一下英文摘要中語態和時態的用法。

英文摘要的字數大多數期刊規定不超過250個詞，內容應與中文摘要對應。醫學論文中，一般少用第一人稱和主動語態，多用第三人稱和被動語態，用以體現敘述客觀事實。所用時態需與事情發生時間一致，敘述基本規律時可用現在時，敘述研究對象、方法和結果時，用過去時。舉例如下：

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 pointspoor 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 rating2.42 pointsSE=0.12)than on the transportable scanner(average rating3.10   pointsSE=0.12(p=0.001).Depiction of the cerebellummidbrainand supratentorial gray? white matter was better on the fixed scanner(p＜0.05＝.Howeverwe 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.Howeverimages 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.

上面是AJR(美國放射學雜志)中一段完整的英文摘要，從中可以看出其特點：

①用詞簡練、準確；

②時態為過去時；

③不用第一人稱，多用被動語態；

④方法和結果中強調統計方法及數據。對母語非英語的作者來說，撰寫英文摘要的質量好壞直接與作者的英文水平有關，在這方面，只有多閱讀英文文獻，才能提高英文寫作水平，從而寫出高質量的英文摘要。

英語類論文發表期刊推薦：《國際英語教育研究》

期刊周期：月刊

期刊級別：國家級

國內統一刊號：國際刊物，沒有國內刊號

國際標準刊號：2310-3442

主辦單位：Singapore Chinese Cultural Association；Singapore New Century Education Association

主管單位：Singapore National Cultural Exchange Center；

《國際英語教育研究》雜志已經面向全球所有的華人地區發行，每期發行量超過10萬份，在美國唐人街、新加坡、中國香港等地被廣泛訂閱。由于廣受好評，《國際英語教育研究》雜志中的英文論文，每期雜志中已經有很大比例的文章被美國湯姆森中心的SCI數據庫與CPCI-SSH數據庫全文收錄。