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A Pakistani boy cools himself off in a water canal as the temperature reached 42 degree Celsius in southern Pakistani port of Karachi on Oct. 13, 2017. (Xinhua/Arshad)

A Pakistani boy cools himself off in a water canal as the temperature reached 42 degree Celsius in southern Pakistani port of Karachi on Oct. 13, 2017. (Xinhua/Arshad)