例如，声音卫士显示图标和其他可视化提示来指示系统已经发出报警或其他警告。
For example, SoundSentry displays ICONS and other visual cues to indicate that the system has sounded an alarm or other warning.
终于，我听到了收音机里宣布爆破即将开始的声音，鸣枪示警和汽笛警告使人一阵警觉。
Eventually I heard over my radio that the detonations were imminent. Warning shots and a siren gave a moment's alert.
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