当听到消防报警时 on hearing fire alarm
当听到报警
When the alarm is heard
以上为机器翻译结果，长、整句建议使用 人工翻译 。
并且，你需要让家里的孩子识别报警器的声音，当他们听到报警器的声音时知道应该怎么做。
Also make sure any children in the home recognize the sound of the smoke alarm and are aware of what to do should they hear it go off.
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