Since the 20th century,technologies for outer space exploration have developed rapidly,but we still know little about the deep sea on Earth.'We know even less about the deep sea than the Moon or Mars',Professor WANG Pinxian from the Chinese Academy of Science once remarked.It means that we are on a relatively low level of scientif ic research about the deep sea,but it also indicates a huge potential in the f ield.1.The manned deep-sea submersible will guide the development of deep-sea exploration technologies The deep-sea exploration technology is a complicated and integrated set of high technology that involve many S&T disciplines and can provide methods and instruments for the scientif ic research and resources exploration of the deep sea.It can also promote the development of a variety of general technologies and equipment concerning deep sea exploration.The technology is an essential means to detect resources in
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