用Audacity打开该文件，启用“频谱图”视图，会发现低频段存在摩斯电码节奏。 将其转换为ASCII字符，得到最终flag。 这步把逆向结果转化为可听、可见的物理信号，极大增强成就感。

这里要划重点：“不可再生”指的是那些你无法从云端、无法从其他设备同步、也无法重新下载的原始文件。 比如，手机里导出的、未经压缩的4K家庭录像；孩子从小学到初中的手写作业扫描件；自己用Audacity录制的、未保存工程文件的原始音频素材。

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