[航]
upper space of silence
... upper flashing beacon 飞机上部闪光灯标 upper space of silence 顶空盲区 upper speed cone 高速锥 ...
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overhead cone of invisibility
顶空盲区 overhead cone of invisibility; upper space of silence 覆盖盲区 coverage hole .
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upper space of silence
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upper space of silence
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