1·色拉寺是藏传佛教格鲁派宗师喀巴派其八大弟子之一的释迦益西于明代永乐十七年（1419年）建造。
It was built by shvakya-ye-shes one of the eight disciples of Tsongkhapa in Yongle seventeen years of Ming Dynasty(i. e. 1419 AD).
2·历史上北京的明城墙全长约40公里，始建于明永乐17年(公元1419年)，距今已有580多年的历史。
The city wall of Ming in history in Beijing is about 40 kilometers long, which was built at Yongle17 of Ming Dynasty (AD 1419). It has passed more than 580 years of history.