In 749 AD, Cen Shen set out on his westward journey for the first time in his life. When he passed Yangguan and entered the Western Regions, the first thing he faced was the endless desert Mohe Yanqi.This strange and grand desolation aroused Cen Shen's deep nostalgia, so he wrote - Qi Zhongzuo -.Yang Yu's trip to the frontier began from the geographical center of Asia, where he felt the fireworks of the Gobi.