A researcher adjusts the equipment on the research vessel "CHUANGXINYI" at Yantai port, east China's Shandong Province, June 10, 2019. The Chinese Academy of Sciences (CAS) Monday launched a marine survey, with four vessels setting sail from three Chinese ports to research the health of China's coastal waters. (Xinhua/Tang Ke)
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Source: Xinhua| 2019-06-11 15:39:25|Editor: xuxin