You want the validator to sound the alarm when this data is missing so you will not have to hand code the validation yourself.

您为了避免自己手工编写验证代码，可能想让验证器在数据缺失的时候发出警报声。

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So that the system will automatically stop after the completion of the workload. If the material is missing or abnormal condition occurs, the system will send out alarm information.

如此往复直至完成设定的工作量后系统自动停止。中途缺料或者出现异常情况系统均会发出报警信息。 。

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To solve the locating, misdeclaration and missing alarm issues in conventional fire-alarm system which is with simple functions, we propose a novel intelligent fire alarm system design in this paper.

针对传统智能建筑中火灾报警系统功能简单、定位困难且存在误报和漏报等问题，本文提出—种新的智能火灾报警系统设计。

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The second man raised the alarm for the missing 41-year-old, who had moved to Blackpool from Barrow in Cumbria.

BBC: Paul Morris

After Sierra's family raised the alarm that she was missing, some of her belongings -- including her passport and medical cards -- were found in her room in Istanbul, though her iPhone and iPad were not there, according to her husband.

CNN: Body of missing NY mother found in Turkey