Aerial photo shows technicians of State Grid Zhejiang Electric Power Company checking power transmission lines to make sure the stable operation of local power supply in Zhoushan, east China's Zhejiang Province, Oct. 23, 2020. (Xinhua/Xu Yu)

Aerial photo shows technicians of State Grid Zhejiang Electric Power Company checking power transmission lines on a giant power supply pylon to make sure the stable operation of local power supply in Zhoushan, east China's Zhejiang Province, Oct. 24, 2020. (Xinhua/Xu Yu)

Aerial photo shows a technician of State Grid Zhejiang Electric Power Company checking power transmission lines to make sure the stable operation of local power supply in Zhoushan, east China's Zhejiang Province, Oct. 24, 2020. (Xinhua/Xu Yu)

Aerial photo shows technicians of State Grid Zhejiang Electric Power Company checking power transmission lines on a giant power supply pylon to make sure the stable operation of local power supply in Zhoushan, east China's Zhejiang Province, Oct. 24, 2020. (Xinhua/Xu Yu)

Aerial photo shows technicians of State Grid Zhejiang Electric Power Company checking power transmission lines to make sure the stable operation of local power supply in Zhoushan, east China's Zhejiang Province, Oct. 23, 2020. (Xinhua/Xu Yu)