A pair of female polar bears play at Haichang aquarium in Tianjin municipality on June 6, 2012. The twin bears were born on March 5 and cared for by keepers. Now they weigh 15 kilograms and are developing normally. [Photo/Xinhua]
Polar bear twins are fed at Haichang aquarium in Tianjin municipality on June 6, 2012. [Photo/Xinhua
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