摘要的內(nèi)容
摘要的作用：簡明但稍微具體地反映一篇論文的主要內(nèi)容，供閱讀、編入數(shù)據(jù)庫等。
摘要構(gòu)成：國內(nèi)期刊要求：目的、方法、結(jié)果、結(jié)論。國外, 不同期刊要求不同。如N Engl J Med要求：Background, Method, Result, Conclusion；JAMA則要求：Context (上下文，相當于Background), Objective, Design and Setting, Patients, Intervention, Main Outcome Measures, Results, Conclusions. 要求更詳細而具體，實際上也可以分成4個部分。Lancet要求與N Engl J Med基本相同：Bckground, Methods, Findings, Interpretation.
目的
多用動詞不定式短語表示。如：[Abstract] Objective? To evaluate the reliability of 13C-urea? breath? test (13C-UBT) in the diagnosis of Helicobacter pylori (HP) infection by using gastroscopy and serum HP antibody testing.
表示目的的這一段文字應盡可能避免與文題完全重復。
常用于表示目的的動詞不定式短語有以下這些：To evaluate …，To explore …，To understand …，To clarify …
To determine …，To compare …，To test the hypothesis that ...
有些期刊(包括國內(nèi)期刊)在目的這一部分允許加一些背景資料，同時指出研究目的。例如：Objective Although the potential for life-threatening allergic reactions in children is a significant health concern for schools, there is little information about the circumstances surrounding anaphylactic events that occur in schools. The objectives of this study were to determine the incidence of anaphylaxis in schools, describe the circumstances around anaphylactic events, assess practices that are used to manage students with life-threatening allergies, and identify opportunities for improvement. (Pediatrics. 2005, 116(5):1134)
在這種情況下，需要用完整的句子表示研究的目的，常見的表示目的的句子和詞語有：The present study aimed at … （接動名詞或名詞)
The purpose of this study was to …;
We determined … to clarify …,
We aimed to see …
We conducted the present study to …
The present study was designed to … (conducted to …)等等。
但這里應當特別指出的是：這類句子的謂語動詞時態(tài)都應用一般過去時。此外，這種表示研究目的的句子，不是直接接在Objective這一小標題后面的。
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