求翻译：平时之文献积累或有意识之文献调研，都是这些工作的基础。而科学论文前言所需回答的主要问题，无不需要认真的文献研读。因此，参考文献之引用一定是论文正式写作前就确定好的，而不能先写好论文再来补参考文献。参考文献之恰当引用，对于一篇论文的质量其实是非常重要。是什么意思？

Usually the accumulation of literature or a sense of literature research, are the basis of these work. Scientific papers the foreword required to answer the main problem does not require serious study of literature. Therefore, the references of references must be determined before the formal writing

The literature usually accumulate, or conscious of literature research, are the basis of that work. The preface and scientific papers to answer the main questions that need to be serious literature are read. Therefore, the reference literature references of a formal thesis before writing on good, bu

Usually the literature accumulates or consciously the literature investigation and study, all is these work foundation.But the scientific paper foreword must reply the main question, needs the earnest literature to read all.Therefore, quotation the reference is certainly before paper official writin

Normal accumulation of documents or conscious of literature research, are the work of the Foundation. And required the introduction of scientific papers to answer problems, all require careful studying literature. Therefore, reference literature references must be identified before the formal writin

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