A traffic policeman wears mask while working on a crossroad in Jinan, capital of east China's Shandong Province, Nov. 16, 2015. (Xinhua/Zhang Zhilong)
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A traffic policeman wears mask while working on a crossroad in Jinan, capital of east China's Shandong Province, Nov. 16, 2015. (Xinhua/Zhang Zhilong)
