Underwater robot tested in S. 皇冠体育app Sea
皇冠体育app Daily | 2017-07-25 06:54
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Scientific researchers make preparation for the first experimental operation of the country's self-developed underwater robot in the South 皇冠体育app Sea, July 24, 2017. It is expected to stay underwater for 20 hours. [Photo/Xinhua]
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