and visitors can reach their seats directly via wooden planks along the cliff instead of climbing rope ladders. 不怕！溜一段80米长的溜索，探索别有“洞”天的“地下世界”。 Don't be afraid! Zip across an 80-meter-long zip line and ...

7 meter ladder = 7 x 3 rungs + 1 rung = 22 rungs = 22 x 1.8 meters of rope = 39.6 meters of rope Allow yourself some reserve for tying knots and burning ends. 41 meters should be enough.