Aerial photo taken on Nov. 26, 2018 shows Zhou Hongyun (L) and his colleague checking the cables of a cliffside elevator in the Wulingyuan scenic spot in Zhangjiajie City, central China's Hunan Province, Nov. 26, 2018. Zhou Hongyun, 42, has been working as a mechanic servicing the 335-meter cliffside Bailong elevator for 18 years. His work is to conduct routine checks on the elevator and troubleshoot potential faults to guarantee its safe operation. (Xinhua/Wu Yongbing)