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

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

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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 ______.

Why is ocean exploration not so expensive as space travel?
   Because ______ for submersibles to get away from the Earth’s gravity.
选项
答案there’s no need
解析
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