英语中有两种冠词，定冠词(the)和不定冠词(a, an)。SCI论文冠词的正确使用方法是什么？

　　使用名词时，如果前面需要加冠词，就要考虑选择哪类冠词，这取决于名词本身。

　　定冠词“the”

　　(1)表明特定事物。The culture that was contaminatedwas discarded.

　　\ The Nobel prizewinner in 2006 inmedicine…

　　(2)与短语连用。…in the presenceof … \ …in the absence of…

　　(3)用以复述前文提到过的事物。The technician looked at the sample we had measured earlier.

　　\ Themethods described previously.

　　不定冠词“a” “an”

　　(1)表示群体中的一员或第一次提到的事物。A scientist needs to write well.

　　\ She used an aliquot to determineDNA concentration.

　　(2)表示一类事物。A protein can be made up of manydifferent amino acids.

　　零冠词

　　(1)复数名词且第一次提到。She collected samples for DNA isolation.

　　(2)专有名词或抽象名词。Berlin was a divided city. \ Degradationoccurs after 24 hrs.

　　\ In conclusion, we determined that…

　　“the”, “a”, “an”

　　当将专有名词或抽象名词作一般名词使用时。The Berlin that was divided is gone.

　　\ The degradation we observed Occurredafter 24hrs.

　　\ The conclusion of thediscussion should summarize the results.

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