用氫氣沒有問題，隻要放飛的人不抽煙，放飛到氣球進入平流層之前沒雷暴就得，到1萬米以上就沒有雷暴了

來源: 天青水藍於 2023-02-07 14:16:03 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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