China s scientific research ship Tansuo-1 returned to a port in the city of Sanya, in south China s Hainan Province, on Sunday, after completing its deep-ocean expedition to the Mariana Trench.
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SANYA, Dec. 5 (Xinhua) China scientific research ship Tansuo-1 returned to a port in the city of Sanya, in south China Hainan Province, on Sunday, after comp