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  3. As in the field of space travel, so in undersea exploration new technologies continue to appear. They share a number of similari

As in the field of space travel, so in undersea exploration new technologies continue to appear. They share a number of similari

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问题    As in the field of space travel, so in undersea exploration new technologies continue to appear. They share a number of similarities with each other--as well as some important differences.
   Manned submersibles, like spaceships, must maintain living c
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答案communication problem
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