If you search in the dictionary, pure refers to things that are free of dirt or pollution, that have a uniform composition, that are complete and sinless.
如果你翻查一下字典，会发现“纯”这个词是指干净没有被污染过的，成分单一的，完善和清白的。
On the basis of literature search on the basis of the species of occidentalis, composition, pharmacology, clinical application, development and utilization of its depth to provide reference.
在广泛文献检索基础上，综述了望江南的种属、成分、药理、临床应用，为其深入开发利用提供参考依据。
We start with the vertical search engine concept, principle, composition, workflow research and the analysis.
本文先从垂直搜索引擎的概念，原理，组成，工作流程等方面研究和分析入手。
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