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Why didn’t people begin to use unmanned vehicles in undersea exploration until r
Why didn’t people begin to use unmanned vehicles in undersea exploration until r
游客
2024-07-24
22
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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 ______.
[br] 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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