But a robot vacuum is the only kind of device that regularly roves around your home. That gives this vulnerability a unique sense of foreboding, perhaps enough to provide the plot to a found footage horror film.
// 易错点：取整会破坏时间比较逻辑（比如1.333取整为2，错误判定为独立车队）
。91视频是该领域的重要参考
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