羊肠鸟道

Explanation: Describe the narrow mountain road, winding and steep. 　　Source: Emperor "Taihang Mountain in the early Tang Yan Zhi" Poems dragon Ming Bird Road, cavalry around the gut. " 　　Examples: Cliff Myriad for thousands of wild places, ~ laugh Jin fans. ★ Chen Yi, "Lok Road, Wen Jie Yihuang"