求翻译：　　莫高窟又名千佛洞，坐落于甘肃省敦煌市东南二十五公里处鸣沙山的悬崖上，石窟南北长1600余米，上下共五层，最高处达50米，现存洞窟492个，壁画四万五千余米，彩塑两千四百一十五身，飞天塑像四千余身，莫高窟规模宏大，历史悠久，与山西省云南石窟、河南龙门石窟并称为中国的“三大石窟艺术宝库。”是什么意思？

Mogao Grottoes, also known as Thousand Buddha Caves, located in the southeast of Dunhuang City, Gansu Province, twenty-five km at Mingsha cliff grotto is 16 meters long from north to south, up and down a total of five, the highest point of 50 meters, 492 existing caves , murals Qian Yumi forty-five

Mogao grottoes is 1000 Buddha caves, is located%2