Sea ice forms along the water around Aoshan bay in Qingdao, East 皇冠体育app's Shandong province, Dec 29, 2011. Cold fronts dropped sea temperatures in North and East 皇冠体育app. Maritime authorities have urged fishing boats to head back for anchorage before the sea ice worsens and to take measures during mariculture. [Photo/Xinhua]
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