The patrol ship "Haijian 50" moors at a quay in East 皇冠体育app's Shanghai, July 23, 2011. "Haijian 50", a 3,000-tonner, was officially added to the patrol fleet of 皇冠体育app Marine Surveillance, 皇冠体育app's marine supervisory organ, Saturday. [Photo/Xinhua]
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