(1)介绍背景资料时,如果句子的内容为不受时间影响的普遍事实,应使用现在时(the present tense);如果句子是对某种研究趋势的概述,则采用现在完成时。 例如:
The authors review risk and protective factors for drug abuse, assess a number of approaches …
Previous research has confirmed four dimensions of temperament:…
(2)在叙述研究目的或主要研究活动时,如果采用“论文导向”,多使用现在时(如:This paper presents…);如果采用“研究导向”,则使用过去时(This study investigated…)。 例如:
This article summarizes research on self-initiated and …
(3)概述实验程序、方法和主要结果时,通常用现在时。 例如:(www.xing528.com)
We describe a new molecular approach to analyzing the genetic diversity of complex microbial populations．
Our results indicate that p21 may be a universal inhibitor of cyclin (细胞周期调节蛋白)kinases (磷酸根转移酶)．
(4)叙述结论或建议时,可用现在时,臆测动词或May, should, could 等助动词。 例如:
We suggest that climate instability in the early part of the last interglacial (间冰期) may have delayed the melting of the …
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