Waterflow indicator used to sound alarm, light signal, actuate relays or starter switches for motors, pumps, etc., when low occurs.

流量指示器用于声音报警，灯光报警，当流量发生时启动电机、泵等继电器或起动器开关。

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In the rich world a ratio of more than four would sound alarm bells; in other Asian countries prices are typically 5-7 times income.

在发达国家高于4倍的比例足以引起警戒；在其他亚洲国家比较典型的数据是5 - 7倍。

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Waterflow indicator used to sound alarm, light signal, actuate relays or starter switches for motors, pumps, etc. , when no flow occurs.

流量开关用于声音报警，灯光报警，当无流量时启动电机、泵等继电器或起动器开关。

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So when the fire alarm bell rang, men near the sound of the fire bell dropped what they were doing and rushed out to fight the fire.

VOA: special.2009.05.17

Christina McAnea, head of health at the union Unison, said the report showed the deal was a "dangerous" experiment, which should "sound alarm bells".

BBC: NHS 'must be tougher negotiator' on private deals

The Independent says an apparent change in bailing and sentencing practice, and the speed with which cases are being processed, should sound alarm bells.

BBC: Newspaper review: Jobless figures make grim reading

Meant to sound the alarm, the songs now serve as a poignant postscript to Katrina.

NPR: Tab Benoit: 'Voice of the Wetlands'