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Unmanned boats conduct geological survey in Hainan

China Daily/Xinhua | Updated: 2017-10-24 07:22
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A ship carries two unmanned boats－Jinghai 3 and Jinghaihong－to survey the marine geological conditions in the Dongmaozhou Island off Sanya, Hainan province, on Oct 23, 2017. [Photo/Xinhua]

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