Aerial photo taken on June 1, 2018 shows the Qingdao Jiaozhou Bay Bridge in Qingdao, east China's Shandong Province. The 36.48-km cross-sea bridge connects the urban district of Qingdao City to its Huangdao district. (Xinhua/Guo Xulei)

Aerial photo taken on June 1, 2018 shows the Qingdao Jiaozhou Bay Bridge in Qingdao, east China's Shandong Province. The 36.48-km cross-sea bridge connects the urban district of Qingdao City to its Huangdao district. (Xinhua/Guo Xulei)

Aerial photo taken on June 1, 2018 shows the Qingdao Jiaozhou Bay Bridge in Qingdao, east China's Shandong Province. The 36.48-km cross-sea bridge connects the urban district of Qingdao City to its Huangdao district. (Xinhua/Guo Xulei)

Aerial photo taken on June 1, 2018 shows the Qingdao Jiaozhou Bay Bridge in Qingdao, east China's Shandong Province. The 36.48-km cross-sea bridge connects the urban district of Qingdao City to its Huangdao district. (Xinhua/Guo Xulei)

Aerial photo taken on June 1, 2018 shows the Qingdao Jiaozhou Bay Bridge in Qingdao, east China's Shandong Province. The 36.48-km cross-sea bridge connects the urban district of Qingdao City to its Huangdao district. (Xinhua/Guo Xulei)