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 does the author mean by saying "more challenging" in the last paragraph?
选项
答案More demanding
解析
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