The third chapter is the most important part, which assembles the stone shovels of the same type and then discusses the evolvement of stone shovels'types in Pre-Yangshao Culture in Northern China.
第三章是论文的主要部分，利用考古类型学的方法对石铲进行分型研究，探索其形式演变的规律。
Lack of Pre - Yangshao Culture period in Shanxi area of the middle Hunghe River valley probably relates to the unique geographical position and natural environment of Shanxi area.
黄河中游山西地区前仰韶时代文化的缺失，很可能同山西地区独特的地理位置和自然环境有关。
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