Introduction的写作时态

前言（Introduction）：

这部分用到的时态很多变，不能一概而论。

研究背景描述的如果是经典原理，事实，或目前为止最前沿的结果，作者写论文时仍认为是正确的（即使是曾经发生的），用一般现在时。

比如：CircRNAs are recently identified as a naturally occurring family of noncoding RNAs that is highly represented in the eukaryotic tranome.

描述已经完成的事，强调 “曾经”，目前为止对此持肯定态度，用现在完成时。

比如：A large number of circRNAs have been successfully identified in various cell lines and across different species.

曾经的研究，其结果现在为止仍然正确，则一句话中可以既有完成时，也有一般现在时。

比如：Recent studies have shown that exon circularization is facilitated by complementary sequences and regulated by specific protein factors.

以作者为主语，阐述曾经的研究结果，如果该研究结果仍然正确，则谓语动词用过去时，从句中仍使用一般现在时。

比如：Poliseno et al. recently proposed that the high sequence homology enablespseudogenes to compete with their parental genes for a shared pool of common miRNAs.

曾经的研究，但已经过时或失效，作者怀疑其正确性，或要否定其正确性时，用过去时或过去完成时。

比如：Nevertheless, these species had generally been considered to be of low abundance and likely representing errors in splicing.

LincRNA-p21 was initially identified as a direct tranional target of p53.

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