2. 外语
  3. Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. What

Why didn’t people begin to use unmanned vehicles in undersea exploration until recently? It is because of the ______. What

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问题 Why didn’t people begin to use unmanned vehicles in undersea exploration until recently?
   It is because of the ______.

What will happen to a submersible in deep water if it is not well built?
   It is most likely to ______.
选项
答案get crushed
解析
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