Introductory remarks: Mainly give an account of the summary of study present situation, the theory bases and the main research methods of this paper.
导论主要讲述了研究现状综述、本文的理论依据与主要研究方法。
Abstract: This article mainly analyze urban air quality present situation in China and the key factors affecting urban air quality study.
摘要：本文针对我国城市的空气质量现状及影响城市空气质量的主要因素进行分析研究。
But considering the present study situation in China, the theory study in the thesis makes for the advance of the traffic sign recognition.
但考虑到我国目前的研究现状，本文的理论研究对于交通标识牌的识别还是有一定的作用的。
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