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
Aerial photo taken on Sept. 19, 2019 shows brine pools of the Hangu salt mine in north China's Tianjin Municipality. (Xinhua/Yue Yuewei)
Aerial photo taken on Sept. 19, 2019 shows brine pools of the Hangu salt mine in north China's Tianjin Municipality. (Xinhua/Yue Yuewei)