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The Bosphorus strait is covered in heavy fog in Istanbul, Turkey, Feb. 21, 2019. Heavy fog hit Turkey's largest city Istanbul on Thursday, causing hundreds of flights and ferries to be canceled or delayed. (Xinhua/Xu Suhui)
The Bosphorus strait is covered in heavy fog in Istanbul, Turkey, Feb. 21, 2019. Heavy fog hit Turkey's largest city Istanbul on Thursday, causing hundreds of flights and ferries to be canceled or delayed. (Xinhua/Xu Suhui)