契丹是中国古代北方游牧民族，本无用玉传统，建国后却大量使用玉器。
Khitan was the northern nomadic people of ancient China. It originally had no tradition to use jade articles.
跟世界上其他国家一样，中国古代的时候，发生过很多战争。这些战争常常发生在北方游牧民族和汉族之间。
Just like other countries, there were many wars in China's ancient times. These wars often broke out between the northern nomadic tribes and the Han tribe.
研究表明，中国古代北方草原游牧民族进入文明时代的时间较以前认定的时间提前了整整一代人。
It is verified that the time of ancient prairie nomad in North China coming into civilization is put forward to a whole generation before.
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