When the system determines visitors to acquaintances (in safety case), do not produce alarm, otherwise select and create alert.
当系统判定访客为熟人(即安全情况)时，不产生报警，反之则产生报警。
When the system determines visitors to acquaintances (in safety case), do not produce alarm, otherwise select and create alert.
当系统判定访客为熟人(即安全情况)时，不产生报警，反之则产生报警。
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