SCI论文引言的时态选择
2024/4/23 9:40:16 阅读：60 发布者：
SCI论文引言中通常混合使用一般现在时和过去时。那么如何区别和使用这两种时态呢？
1. 当所描述、讨论的内容始终为真(客观事实，真理)的时候，应当用一般现在时态; 而过去时态一般用于描述早期的研究工作。
早期研究的例子（简单的过去）：This same research team discovered a similar enzyme in their 2012 study.
Graphene was properly isolated and characterized in 2004 by Andre Geim and Konstantin Novoselov at the University of Manchester.
In 2000, Smith reported that ...
如果时间未知或不重要，一般使用现在完成时。
示例：Previous literature has indicated a correlation between X and Y.
Since the early 2000s, a number of companies and research laboratories have been working to develop commercial applications of graphene
对于前人工作结论的描述声明，多使用现在完成时。
例子：The effect of diameter of gold nanoparticle has not been studied due to ...
先前的发现被现在新的研究否定的情况时，通常使用过去式
例子: Graphene was considered non-existent, however, ...
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