Ships pass the approach channel upstream of the Three Gorges Dam in Yichang, central China's Hubei Province, June 9, 2020. The water level of the Three Gorges reservoir dropped to 144.99 meters as of Monday afternoon, two days ahead of schedule, in a bid to make room to contain water from potential seasonal flooding. (Photo by Zheng Jiayu/Xinhua)

In this aerial photo, ships anchor at an anchorage while waiting to pass through the ship lock of the Three Gorges Dam in Yichang, central China's Hubei Province, June 9, 2020. The water level of the Three Gorges reservoir dropped to 144.99 meters as of Monday afternoon, two days ahead of schedule, in a bid to make room to contain water from potential seasonal flooding. (Photo by Zheng Jiayu/Xinhua)

A cargo ship passes a hydrological scale upstream of the Three Gorges Dam in Yichang, central China's Hubei Province, June 8, 2020. The water level of the Three Gorges reservoir dropped to 144.99 meters as of Monday afternoon, two days ahead of schedule, in a bid to make room to contain water from potential seasonal flooding. (Photo by Zheng Jiayu/Xinhua)

Aerial photo taken on June 8, 2020 shows ships passing through the ship lock of the Three Gorges Dam in Yichang, central China's Hubei Province. The water level of the Three Gorges reservoir dropped to 144.99 meters as of Monday afternoon, two days ahead of schedule, in a bid to make room to contain water from potential seasonal flooding. (Photo by Zheng Jiayu/Xinhua)

Photo taken on June 8, 2020 shows the Three Gorges Dam in Yichang, central China's Hubei Province. The water level of the Three Gorges reservoir dropped to 144.99 meters as of Monday afternoon, two days ahead of schedule, in a bid to make room to contain water from potential seasonal flooding. (Photo by Xiang Hongmei/Xinhua)