介绍了轿车灯光系统的分类和功用，详细列举了各种前照灯，分析了轿车灯光系统的现状及其发展趋势。
This paper introduces the classification and functions of lighting system of Saloon, lists up each headlamp, and analyzes the present situation and development trend of lighting system of Saloon.
该方法采用分层分类的思想，不断地将灯光阈值相近的行政单元划分到相同的集合，直至集合内各行政单元的灯光阈值完全相同为止。
The administrative regions with close thresholds were divided into the same set by LTM continually. The process was ended until the thresholds in one set were selfsame.
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