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surveillance balloons 在 What are 'spy balloons' and why are they used? - Al Jazeera 的相關結果
Surveillance balloons have a long history in espionage, and continue to provide some spying advantages, experts say. surveillance Balloon. ... <看更多>
surveillance balloons 在 Observation balloon - Wikipedia 的相關結果
An observation balloon is a type of balloon that is employed as an aerial platform for gathering intelligence and spotting artillery. The use of observation ... ... <看更多>
surveillance balloons 在 Analysis: How spy balloons work, and what ... - PBS 的相關結果
A spy balloon is literally a gas-filled balloon that is flying quite high in the sky, more or less where we fly commercial airplanes. It has ... ... <看更多>