- 问题详情:Youneverseethem,buttheyarewithyoueverytimeyoufly.Theyrecordwhereyou’regoing,howfastyou’retravelingandwhethereverythingonyourairplaneisfunctioningnormally.Theirabilitytostandalmostanydisastermakesthemseemlikesomethingoutofacomicbook.They’re...
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