gas alarm

例句：

1. 1. The gas alarmwent off when the house caught fire.
   当房子起火时，气体报警器响了。
2. 2. Gas alarms are used to detectdangerous gases in homes.
   气体报警器用于检测家庭中的有害气体。
3. 3. Gas alarms can be triggered by a variety offactors, such as smoke or carbon monoxide.
   气体报警器可以通过多种因素触发，如烟雾或一氧化碳。