如果氣球不可控，放飛者事先算好了高空大氣的流向，放飛後數日按計劃隨氣流飛回原處。這技術更可怕了。也不知此氣球是否呈水滴狀

來源: 21-C 於 2023-02-03 16:36:05 [舊帖] [給我悄悄話] 本文已被閱讀：次

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