The ups and downs of polo in ancient China is a typical display of the regular pattern of "normal curve" popularizing nowadays, and has formed a whole period of popularity.
中国古代马球运动兴衰演变的过程，典型地体现出时尚流行的“常态曲线”规律，构成了一个完整的流行周期；
The ups and downs of polo in ancient China is a typical display of the regular pattern of "normal curve" popularizing nowadays, and has formed a whole period of popularity.
中国古代马球运动兴衰演变的过程，典型地体现出时尚流行的“常态曲线”规律，构成了一个完整的流行周期；
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