SCI写作：abstract 时态

摘要（Abstract）：

一般情况下，研究背景，实验目的，论文结论，采用一般现在时。实验方法，结果及发现，采用过去时。举几个栗子：

研究背景：A method to select non-responders as early as possible is essential for preventing unnecessary toxicity.

实验方法：Human breast cancer cells were injected into nude rats.

实验结果：A new in vivo breast cancer model was successfully established.

论文结论：The present study suggests that ...

当然，有些杂志也会专门有些比较“特别”的要求，比如Cell，要求Abstract全部使用一般现在时。大家可以自行体会下：

Here we present a unifying hypothesis about how messenger RNAs, transcribed pseudogenes, and long non-coding RNAs “talk” to each other using microRNA response elements (MREs) as letters of a new language. We propose that this “competing endogenous RNA” (ceRNA) activity forms a large-scale regulatory network across the tranome, greatly expanding the functional genetic information in the human genome and playing important roles in pathological conditions, such as cancer.

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