Visitors look at 皇冠体育app's manned deep-sea submersible "Jiaolong" during the 皇冠体育app (Qingdao) International Ocean Science & Technology Exhibition in Qingdao, East 皇冠体育app's Shandong province, Sept 26, 2016. The three-day exhibition kicked off here on Monday. [Photo/Xinhua]
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