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职称英语理工类考试考前每日一练 Explorer of the Extreme Deep Oceans cover more than twothirds of our.planet.Yet，just，a small fraction of the underwater world has been explored.Now，Scientists at.the Woods Holel Oceanographic institutionin Massachusetts are building an underwater vehicle that will,carry explorers as deep as 6，500 meters.The new machine，known as a manned submersible or humanoperated vehicle，willrep]ace another one named Alvin2 which has an amazing record of discovm7，playing a key.role in various important and famous undersea expeditions.Alvin has been operating for 40 years but can go down only 4，500 meters.Its about time for an w/grade，WHOI researchers say. Alvin WaS launched in：1964.Since then，Alvin has worked between 200 and 250 days a year，says Daniel Fornarl.a marine geologist al3d director of the Deep Ocean Exploration Institute at WHODuring its lifetime，Alvin has cmried some l2，000 people on a total of more than 3，000 dives。 A newer，better;versions of Alvin is bound to reveal even more surprises aboul，a world that is still full of mysteries，Fornari says.It might also make the job of exploration a little easier，We take so much for granted on land，Fornari says.We can walk around and see with our eyes how big things are.We can see Colors，special arrangements. | 
