BC. The beginning of the Warring States period. China entered the age of feudalism.
公元前475 年战国时期开始，中国进入封建社会。
If Chinese feudalism is regarded as an organic being, the culture of Song Dynasty had reached the middle age with many mature characteristics.
若把中国封建社会视为一个有机生命，那么，宋代文化已是人到中年，明显呈现出生命成熟期的诸多特征。
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